![]() The ACFT was originally designed to measure a soldiers’ readiness for combat, suitability for advancement, and eligibility to remain in the Army, and consisted of six events. More recently, the leg tuck was incorporated into the Army Combat Fitness Test (ACFT) for the US Army. This exercise anecdotally has been said to stress grip and upper body strength, in addition to abdominal muscular strength and endurance. The individual then flexes at the elbows, hips, and knees to raise their knees or thighs to their elbows, before returning to the starting position. This exercise requires the individual to hang from a pull-up bar with an alternated grip and fully extended arms. The leg tuck, or versions of this movement (e.g., hanging knee raises), are unique exercises that are often adopted to target abdominal and hip flexor muscular development. Pulling strength may be a determining factor in leg tuck performance, which is likely not indicated by the plank. Approximately 80% of the females could complete one leg tuck, although female personnel may require specific strength and power training. Sex, pull-ups, and push-ups predicted the leg tuck ( r 2 = 0.674). The strongest leg tuck relationships were with pull-ups ( r = 0.790) and push-ups ( r = 0.553). The largest difference was for the BOMBT ( d = 2.59) not the leg tuck ( d = 1.28). Male trainees outperformed females in all tests ( p ≤ 0.003). Partial correlations and stepwise regression (controlling for sex p < 0.05) calculated relationships between the leg tuck with the other tests. Independent samples t-tests ( p < 0.05) and effect sizes ( d) compared the sexes. Archival fitness test data included: Illinois agility test (IAT) push-ups pull-ups leg tucks multistage fitness test 4.54 kg backwards overhead medicine ball throw (BOMBT) 10-repetition maximum deadlift and 18 kg kettlebell farmer’s carry over a 91.44 m course. This study investigated the leg tuck in a firefighter trainee population (274 males, 31 females). There is limited leg tuck research, including between-sex comparisons and relationships with other fitness tests. The leg tuck was replaced by the plank in the Army Combat Fitness Test, in part because it was felt it discriminated against women.
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