What’s happening when u tense your muscles like abs or your biceps voluntarily without any reason nor weight to make the muscle contract? could you potentially do exercise by contracting your abs while sitting?

Question

What’s happening when u tense your muscles like abs or your biceps voluntarily without any reason nor weight to make the muscle contract? could you potentially do exercise by contracting your abs while sitting?

In: 2

Answer 1

Bruce Lee used an electric exercise belt to do the equivalent of 500 sit-ups in 15 minutes.