The best option I can think of will be 3 to 5 sessions per week.
The best test would be a BMI. Hydrostatic weighing would just find their weight and wouldn't tell the doctor anything about the specific amount of fat on the body. There is no such thing as an MRK, and the Caliper test is a personality test. I hope this helps!
Fencing (sword fighting) can impact a child's self esteem by teaching them chivalry and respect, as well as exercising them, a parent's role is simply to support them, same can apply to Baseball.
31 lbs or 24% i hope this is correct if not send me a message and ill try to get it right oWo