If you must step up on something, you don't always need to lift your whole body just flex your legs.

His entire body flexed and surged, pressing her hard into the couch.

Her serpentine body flexed sinuously, and was really quite pretty in its motion.

The huge body flexed, hardly needing the stubby legs, and made remarkable speed.

If not, the body will flex and the doors etc. will not fit properly.

Her body flexed from toes to neck, absorbing the impact, keeping her balanced for whatever the next moment required.

A mighty tail thrust downward, and the body flexed along its vast length.

He moved her into position, but her entire body, already stiff with cold, wouldn't flex properly.

As his body flexed at the edges it thinned at the center, drawing them in closer to each other.

The Frenchman's face contracted slightly, the body flexed and the right shoulder twisted an inch or two as the muscles drew at the arm.