The right answer is agility.
You already have balance when you can stand on one foot, what you need is agility to turn quickly.
Agility is the ability to quickly change the position of one's body. This requires a combination of scales, psychomotor coordination, and reflexes.
The following work out "curl ups". This would most likely be when you would have to be laid down, and when you would have to "curl" you back up. And by doing this kind of workout, this would give you muscular endurance in your body, and not only that, but this would also give you (a lot) of strength. So based by looking at your options, your correct answer would most likely be
(D) Both A and B.
Magnesium.
In healthy kids, the amount of urinary* excretion of calcium is about 2.38 +/- 0.66(SD; no =52, mg/kg in about 24 hour.
Over consumption of magnesium can cause the number spike in significant number.
I say it a. stay with the same exercises so that the same muscles become stronger