but skeletal muscles can only exert force by pulling, they cannot push, so moving a joint back and forth requires an antagonistic pair, which is just a fancy way of saying two muscles that pull in ...

a human anatomy lecturer at Howard University. However, back muscles tend to fatigue quicker than others. So, “while maxing out may be difficult, high reps and sets are especially beneficial ...

Walking and running upright on two feet as humans do requires some specialized adaptations of the skeleton and muscles. Modern human anatomy ... painful problems from back injuries to fallen ...