It is just as important to develop our as it is to develop our bodies. hearts
minds
friends

There is not an "all of the above" option.

Explanation:

Although there is a very valid argument to be made for any of these choices, the word minds here actually provides a very common saying, used to address the paramount focus on bettering solely our bodies.

Hope it helps :) and let me know if you want me to elaborate.

answerrunning;