The 35 sit ups in 1 minute Park Ranger Challenge

[Ghost1]

Ideally placing your hands behind the head would prevent you from swinging your arms to gain momentum and force you to isolate the abdominal muscles as the prime mover

But as the assholes that humans are we just use our hands to yank the body up by the top of the head compressing the neck lol

Should have to hold hands behind head without touching it tbc