Gi vs No-Gi BJJ Fitness: What a Small 2025 Study Can—and Cannot—Tell Us

Gi and No-Gi Brazilian Jiu-Jitsu create different gripping and movement problems, but that does not mean every athlete in one format develops the same physical profile. A small study published ahead of print on April 30, 2025 compared selected fitness measures in experienced male athletes who specialized in Gi or No-Gi competition.

Read the original study

Who was studied

The researchers purposefully selected 24 male BJJ athletes between ages 20 and 26. Twelve specialized in Gi and 12 in No-Gi. Participants averaged roughly 5.7 years of experience, trained four to six times per week and had no current musculoskeletal injury. The groups completed general fitness tests, a computer-based reaction test and BJJ-specific tests that included hanging from a judogi.

The Gi group performed better in static grip strength and bent-arm hanging from the judogi. The No-Gi group performed better in simple reaction time, explosive-strength measures and a hybrid agility test. Some other measures did not differ significantly. The authors interpreted the pattern as more endurance-strength emphasis among the Gi specialists and more strength-speed emphasis among the No-Gi specialists.

Why those results are plausible

Gi rounds repeatedly require gripping, maintaining and breaking cloth grips. A judogi hang therefore resembles a demand those athletes practice regularly. No-Gi exchanges usually provide fewer stable cloth grips and can create faster transitions, hand fighting and direction changes. Training specificity offers a reasonable explanation for the different test profiles.

That explanation is still not proof of cause. The study did not randomly assign athletes to a format or measure them before and after a training intervention. Athletes may have selected the format that already suited their strengths, and other training outside BJJ may have contributed.

Important limitations

The sample was only 24 athletes, all young adult men with several years of experience. Results should not be assumed to describe women, older students, beginners, children or every academy. A judogi hang is relevant to Gi gripping, but it does not represent an entire match. Simple reaction and agility tests also do not capture tactical choices, fatigue, partner behavior or technical skill.

The study measured sport-related fitness—not injury prevention, civilian self-defense or success in a confrontation. It should inform questions, not create labels such as “Gi athletes are strong” or “No-Gi athletes are faster.”

A practical AQBJJ application

Train the problem in front of you. Gi students can develop grip endurance while still practicing footwork, reactions and explosive repositioning. No-Gi students can work on fast transitions while still building patient isometric control. If you train both formats, expect some overlap and some distinct demands rather than treating one as a replacement for the other.

For self-defense, clothing grips and faster grip-free exchanges can each offer useful practice, but neither format recreates every environment or guarantees an outcome. The most responsible connection is adaptability: recognize the available grips, maintain balance, create space and leave when possible.

Pair this with Situational BJJ Drilling, then explore more on the AQBJJ Jiu Jitsu blog.

Sources and studies

• Brazilian jiu-jitsu Gi vs NoGi—a comparative analysis of the motor fitness level of athletes specializing in different fighting formats. Journal of Kinesiology and Exercise Sciences. Published ahead of print April 30, 2025. DOI: 10.5604/01.3001.0055.0944.