Depends on which adult it is
It’s saying if you appreciate what you have, you won’t want more. You like what you have. If you concentrate on what you don’t have, “you will never have enough” because you can’t have everything!
The human movement is 4
exercises that use body weight is 5
contracting muscle is 12
holding a contraction is 8
decreasing the angle is 6
strengthening is 3
increasing is 7
lengthening of a muscle is 10
maximum amount of force is 1
isolating muscles is 15
undesirable movements is 14
shortening muscles is 9
sustained contraction is 2
opposing action is 13
increasing the weight is 16
