The gland that regulates metabolism is the Thyroid Gland.
The first one is correct. Weighted squats practice lower body control, and although the repetition is lower, its still more significant. The resting time doesnt matter UNLESS there's a deadline, but hey. Let em' breathe.
that depends on you and your choices you have to put your lifestyle lol
B. It uses closed paddles instead of stringed racquets