The answer is all of the above
30 a day is what i do and im 14 and i tryna get a 6 pack and rock hard abs so do 30 a day
It is swimming because you work your every muscle in your body it is the best sport
This question probably has different answers. It all depends on how you look at it. The best answer would most likley be: Getting your aim right, so that you can kick the ball into the goal.