15 Worthless Exercises You Are Probably Doing

14. Ab crunch machine is another worthless exercise for your abs. The biggest problem about ab crunch machine is that many people cant get into an effective position in the machine. Also, this machine can put too much stress on your spine, which may lead to back strain or even worse, disc injuries. Unfortunately, many people think that this exercise can help them lose belly fat, but in reality, this is not possible by only using ab crunch machine.