​Isotonic exercise is designed to

A) ​increase cardiovascular fitness.
B) ​increase muscle endurance.
C) ​increase muscle strength.
D) ​increase both (b) and (c) .

Isotonic Exercise

Exercise that requires the contraction of muscles and the movement of joints, as in weight lifting.

Muscle Endurance

The ability of a muscle or muscle group to repeatedly exert force against resistance over an extended period.

Cardiovascular Fitness

The ability of the heart, blood cells, and lungs to supply oxygen-rich blood to working muscle tissues and the ability of those tissues to use oxygen to produce energy for movement.