YR Sports Lab
From a standing position you suddenly drop your level, roll a shoulder in, and trap your opponent's foot before they react, and you are now lying on the mat holding their heel. That is the Imanari Roll: a move mocked for looking like random flopping that went on to become an entry frequently discussed in modern leg lock systems. This guide covers its naming and disputed origin, standing and seated entries, three timings, common counters, and why the heel hook finish demands extra care for the knee, using PubMed and IBJJF rule coverage.
1. Origin and Story: Masakazu Imanari, Mocked for "Flopping"
The Imanari Roll is named after the Japanese fighter Masakazu Imanari. According to Wikipedia, he is a Japanese mixed martial artist and submission wrestler with a BJJ black belt, nicknamed "Ashikan Judan" (roughly, the master of leg submissions), and both the Imanari Roll and the leggy neck choke are named after him. Wikipedia currently lists his MMA record as 40 wins, 22 losses and 2 draws (checked 2026/10; records change with new fights).
Who invented the move first is unsettled. FloGrappling's 2017 feature says the roll's origin is "up for debate" and only confirms that the name comes from Imanari, who had been developing unorthodox leg entries since the early 1990s. The article says mainstream MMA once dismissed his style as "flopping" until results forced people to take it seriously. FloGrappling's figures: over 50 pro fights, 11 ended by heel hook (a February 2017 count; his record has since been updated).
A match to check against: Cage Rage 25
Sherdog's record for Jean Silva shows that at Cage Rage 25 on March 8, 2008, Imanari beat Silva by heel hook at 2:30 of round 1. Wikipedia lists this as his Cage Rage featherweight title defense (Wikipedia's text and record table describe the finish slightly differently; this article follows Sherdog's heel hook). It shows his style: not pressure or cardio, but a leg submission that ends the fight quickly.
Sources disagree about his title history in DEEP and other promotions, so this article draws no conclusion there and cites only the match that both sources support.
On how it spread, FloGrappling's summary is: Ryan Hall used it repeatedly to beat opponents on The Ultimate Fighter in 2016; Marvin Castelle of 10th Planet hit one at Fight to Win Pro 24, and the clip had passed 12 million views when the article was published; and the Danaher Death Squad is named among groups that built on Imanari's techniques. FloGrappling also says Rory MacDonald and Tony Ferguson have used it in the UFC, without dates.
The key idea is that it turns a distance problem into a rolling problem: no guard pull, no takedown, just a direct entry from standing into an ashi garami style entanglement. For the wider leg lock picture, see our BJJ leg lock system guide; for the finish itself, see the Heel Hook technique guide.
2. Mechanics: Level Change, Shoulder Roll, Entangle
Evolve breaks the standing version into steps (including rolling over the shoulder on the lead-leg side), and a separate technique write-up (Digitsu) says the target landing is Cross Ashi Garami: lower your level as if shooting a takedown, step the lead leg forward, drop the other knee to create forward momentum, then roll toward the opponent's leg. While rolling, hook the back of the opponent's lead knee with your near leg, thread the far leg across their hip, roll under and past, then pin the captured foot to your chest and control the knee line.
| Stage | Key points |
|---|---|
| ① Drop the level | Sink as if shooting a single leg, step the lead foot outside the opponent's lead foot, stay balanced and agile |
| ② Knee down | Plant the rear knee to create momentum, lean forward, and target one of the opponent's legs |
| ③ Shoulder roll | Roll over the lead-side shoulder into the opponent's base, not away from it |
| ④ Hook and wrap | Near leg hooks behind the knee, other leg crosses the hip, and the leg is entangled |
| ⑤ Lock the position | Secure Cross Ashi Garami at once, pin the foot to your chest and control the knee line before choosing a finish |
Evolve also shows a seated open guard version (demonstrated by Jon Blank): from seated, take a scoop grip on the opponent's leg, fall to the side of the gripping arm, stay a few inches outside the opponent's foot so the roll orbits it rather than hugging it, raise the hips as you roll, entangle with the same-side leg near the hip, and use the free arm in a waiter grip for stability.
Four common mistakes: rolling too far from the opponent, which makes the entanglement hard to get; not hooking the target leg, so the opponent can step over or away; losing momentum mid roll; and hesitating, which Digitsu warns leaves you grounded with no entanglement.
3. Entry Timing and Setups
The three timings below are drawn from Evolve and Digitsu technique write-ups. They are technical summaries, not competition statistics:
First, when the opponent shifts weight forward or steps toward you. Digitsu notes they are less able to retreat then, which makes the entry cleanest.
Second, after a feint. Evolve suggests faking a strike or a takedown in MMA so the opponent ignores the leg threat, then rolling in when a leg attack is least expected.
Third, from seated open guard once you grab a leg. This is the version Evolve demonstrates, useful when you are already on the mat and need to convert standing pressure into a leg entanglement; compare the entanglement logic in Single Leg X Guard.
Evolve also warns that without leg lock fundamentals the roll has little payoff; learn heel hooks and ashi garami variations first, and it does not recommend the roll to absolute beginners.
4. Strengths and Limitations
| Strengths | Limitations |
|---|---|
| Enters a leg lock straight from standing, skipping guard pulls and passes | Easy to sprawl on or sidestep without a setup or against a retreating opponent |
| If it fails you can still roll on top; BJJEE says it can serve as a takedown | When it fails you are on the mat with no entanglement |
| Sudden and hard to predict: a high risk, high reward surprise | The heel hook finish is limited by belt and no-gi rules in IBJJF and carries high knee risk |
5. Common Counters and Defenses
Digitsu's mistakes list, read in reverse, gives the counters: with no setup, or against a retreating opponent, the roll is easy to sprawl on or sidestep. Three directions follow, as technical summary:
First, sprawl: send the hips back and press on the attacker's shoulders and back. The roll then has nowhere to land and your leg stays out of reach.
Second, sidestep or step back. Before the knee hook lands, move the leg away and the attacker only rolls into empty space.
Third, once the entanglement is formed, protect the knee line and fix your position. Do not force a turn; control the knee and foot direction first, then escape. More detail in our heel hook mechanics guide.
Options after the entry is countered
If you are sprawled on mid roll, stop trying to entangle and roll through to the top (using it as a takedown), or scramble back to standing rather than staying stuck.
If you got the entanglement but the opponent turns out, return to Cross Ashi Garami or another stable ashi position before deciding whether to finish; do not crank the leg while the position is loose.
6. Frequency in Competition and Rule Legality
On frequency, the IBJJF event pages publish only placings and brackets, we found no per-technique statistics, and we found no reliable third-party frequency figure for the Imanari Roll, so we describe it qualitatively: it is a high-risk surprise entry seen mainly in MMA and no-gi leg lock competition, as with Imanari, Ryan Hall and Marvin Castelle in FloGrappling's coverage.
On rules, separate the entry from the finish. According to FloGrappling's October 2020 report, the IBJJF planned to open heel hooks (inside and outside) to adult brown and black belts in no-gi from 2021; the exact start date was undecided at the time, so check the rulebook for what is actually in force. Evolve's summary of the 2021 rules adds that heel hooks and knee reaping are banned in gi at all belt levels, banned in no-gi for purple, blue, white and masters divisions, and that white, blue and purple belts may use only straight ankle locks. The IBJJF site currently lists rulebook v6.0 (the file name suggests June 2024); we did not open the rulebook clause by clause, so check the latest rulebook and event notices before competing.
7. Safety: Knee Injury Risk from the Heel Hook
The Imanari Roll itself is an entry; the injury risk comes mostly from the heel hook that follows. A cross-sectional study by Piekarski et al. in Sports Health (2026) used IBJJF data from 2021 (heel hooks legal) covering 303 adult and 455 masters brown and black belt competitors, and from 2009 (heel hooks banned) covering 164 adult brown and black belt competitors, to compare knee and ankle injury rates. In 2021 the exposed group had 26.5 knee injuries per 1000 matches versus 2.2 in the unexposed group, a relative risk of 12.0 (95% CI 1.5 to 96.1, P < 0.001); ankle injuries did not differ significantly (19.8 versus 8.8), and knee and ankle injury rates between 2009 and 2021 did not differ significantly either. The authors concluded that the heel hook significantly increased knee injury risk.
Read this with care: it is Level 4 cross-sectional evidence with a very wide confidence interval, so the estimate is imprecise. An earlier case report by Baker et al. (2010) described a 32 year old MMA fighter with a complete ACL rupture from a heel hook and described the mechanism as knee flexion, valgus and internal rotation at the moment of injury. The literature does not address when pain appears, so this is a safety recommendation rather than a study finding: heel hook injuries often happen at the moment pressure is applied, so tap early.
・Learn leg lock defense and escapes before drilling entries, not only attacks
・If you feel your knee being twisted while caught, tap immediately; do not wait for pain
・Apply the finish slowly and release the instant your partner taps
・As summarized from the 2021 rules, white, blue and purple belts may not use heel hooks in IBJJF competition; follow your gym's rules in training too
・If the knee swells, feels unstable or cannot bear weight, stop training and see a doctor
For a deeper look at leg lock injury mechanisms and rehab, read our heel hook mechanics guide.
FAQ
What is the Imanari Roll, and must it end in a heel hook?
The Imanari Roll is a rolling entry from standing that entangles the opponent's leg, and it does not have to end in a heel hook. BJJEE notes it can lead to a leg lock or, if you skip the leg attack, roll you on top as a takedown.
Can white and blue belts train the Imanari Roll?
You can train the rolling entry, but the finish is restricted in IBJJF competition. Under the 2021 rules summarized by Evolve, white, blue and purple belts are limited to straight ankle locks, and heel hooks are banned in gi at every belt level. Evolve also advises true beginners against it.
What if my Imanari Roll gets sprawled on?
A sprawl means the entry failed, so abandon the entanglement and reset your position at once. Digitsu says the roll is easiest to sprawl on or sidestep when there is no setup or the opponent is retreating. You end up on the mat, so stand up or recover guard instead of forcing it.
Does the heel hook raise the risk of knee injury?
The evidence shows an association. A 2026 Sports Health study of 2021 IBJJF brown and black belts, when heel hooks were legal, found knee injury rates of 26.5 per 1000 matches in exposed competitors versus 2.2 in unexposed ones (relative risk 12.0, with a wide confidence interval of 1.5 to 96.1). It is cross-sectional, so it cannot prove causation.
References
1. Wikipedia contributors. Masakazu Imanari. en.wikipedia.org/Masakazu_Imanari (checked 2026/10; supports nationality, BJJ black belt, the Ashikan Judan nickname, the Imanari Roll being named after him, the 40-22-2 record, and the March 8, 2008 featherweight title defense against Jean Silva)
2. Connell R. The Evolution of The Imanari Roll in MMA & BJJ. FloGrappling, 2017/02/10. flograppling.com (checked 2026/10; third-party article supporting the disputed origin, early 1990s leg entry development, 11 heel hook finishes in over 50 pro fights, and the spread via Ryan Hall, Marvin Castelle and the Danaher Death Squad)
3. Sherdog. Jean Silva fight record. sherdog.com (checked 2026/10; supports Cage Rage 25, March 8, 2008, heel hook at 2:30 of round 1); Sherdog. Imanari, Shirai Booked for Mayhem in Macau. sherdog.com (checked 2026/10; calls him a leglock specialist)
4. Evolve MMA. How To Perfect The Imanari Roll In BJJ. evolve-mma.com (checked 2026/10; supports standing and seated steps, feint setups, common mistakes and the advice against beginners learning it)
5. Digitsu. Imanari Roll. digitsu.com (checked 2026/10; third-party technique write-up supporting the Cross Ashi Garami landing, entanglement details, timing, and the point that a roll without setup is easy to sprawl on or sidestep)
6. BJJEE. You've Got To Try This Hybrid Heel Hook Variation Off An Imanari Roll. bjjee.com (checked 2026/10; third-party article supporting the naming after Imanari and its use as a takedown)
7. Teague H. IBJJF confirm heel hooks for black & brown belts in 2021. FloGrappling, 2020/10/11. flograppling.com (checked 2026/10; supports the IBJJF plan to open heel hooks to adult brown and black belts in no-gi from 2021); Evolve MMA. Where And When Are Leg Locks Allowed In BJJ? evolve-mma.com (checked 2026/10; supports the gi ban at all belts and the lower belt limits); IBJJF. Rules. ibjjf.com/rules (checked 2026/10; lists rulebook v6.0)
8. Piekarski M et al. (2026). Knee Injury in Competitive Brazilian Jiu Jitsu Athletes: Implications for Training. Sports Health;18(4):890-897. PubMed PMID 41549501 (supports knee injury rates of 26.5 versus 2.2 per 1000 matches, relative risk 12.0, and no significant ankle difference)
9. Baker JF, Devitt BM, Moran R. (2010). Anterior cruciate ligament rupture secondary to a 'heel hook': a dangerous martial arts technique. Knee Surg Sports Traumatol Arthrosc;18(1):115-116. PubMed PMID 19629437 (supports the case report of complete ACL rupture from a heel hook and its injury mechanism)