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The Leg Tuck — maybe the most infamous event on the ACFT — is how the Army measures your muscular strength and endurance. Check out Figure 2-8 for an inside look at which muscles need to work during this event. They’re the same muscles that help you get over walls and obstacles as well as climb and descend ropes.

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FIGURE 2-8: Muscles used in the Leg Tuck.

The LTK requires you to use your grip, shoulders, arm and chest muscles, abs, and even your front leg muscles. It’s notoriously tough because it requires you to hang from a pull-up bar with an alternating grip, curl your body (like a shrimp) so that your knees or thighs touch your elbows or the backs of your upper arms, and return under control to the straight-arm hang — all while your body is perpendicular to the bar. Figure 2-9 shows you what the Leg Tuck looks like.

Zack McCrory

FIGURE 2-9: The Leg Tuck.

The starting position for the LTK is a straight-arm hang from the pull-up bar with an alternating grip. Ideally, your dominant hand is supposed to be closer to your head than your other hand is; for most people, that’s the strategy that provides the most power. (Try it both ways when you practice, though.) Your grader can help you get up to the bar if you can’t reach it, and if you’re too tall to hang from the bar with straight arms, you must bend your knees, because your feet aren’t allowed to touch the ground.

On the command “Go,” flex at the elbows, waist, hips, and knees to bring your lower body up. Touch your knees or thighs to your elbows, and then return to the start position under control. If you keep your elbows bent, the rep doesn’t count; the same goes if you swing your trunk or legs to get your knees up. You can, however, adjust your grip. Just make sure you don’t touch the ground while you do it, or your grader will terminate the event.

You only complete a repetition when you return to the straight-arm hang under control. You can’t just drop from the bar on your last rep; if you do, your grader won’t count it.

You have to curl up to the bar once to score 60 points, three times for a score of 65, and five times if you want to earn yourself 70 points. Think you can do it 20 times? If you pull it off, you get a whopping 100 points on this event.