What distinguishes push-ups from other chest exercises such as the bench press and dumbbell flies? a. the bench press also exercises the legs. b. push-ups are a variable resistance exercise. c. push-ups do not require any weights or machines. d. push-ups are not actually chest exercises

The difference between push-ups and other chest exercises such as the bench press and dumbbell flies is that push-ups do not require any weights or machines. Correct C

You can do push-ups any time and anywhere, you don't need any equipment for this type of exercise. Bench press on the other hand can be found in fitness center.