Answer:
The correct answer is B.changing muscle length
Step-by-step explanation:
Isometric exercise involves the contraction of a particular muscle group without changing the length of the muscle and the affected joint does not move in the exercise. Isometric exercise helps in muscle strength because they are done in a single position without any movement.
This allows them to improve the strength of a particular position. Some of the isometric exercises are high plank, self-arm wrestling, forearm plank, low squat, etc. So isometric exercise strengthens muscles without changing the length of the muscle.