Strenuous would fit in the blank
Leg curls are focused on the muscles of the lower leg or hamstrings. Hamstrings are the largest calf muscles which should be exercised and trained frequently. Leg curls can be performed by a lying position. Leg curls should be done properly because, sometimes leg curls can cause back pains and lower back pain.
Answer:
true
Explanation:
Our body needs calories/energy even while we are sleeping