Decline Crunch Community

The sky is really beautiful.. hehe

It's really tough even with 2 setsᅲᅲ

Why is there such a difference in difficulty between putting your hands behind your head and just crossing your arms???

↳ 고정점이 되는 다리로부터 무게중심이 멀어져서 그렇습니당 말아올리는데 필요한 힘은 지렛대로부터의 거리와 정비례합니다.

The translation of "사람죽이는운동" is "exercise that kills people."