fit·ter

Inflected form of the adjective, "fit."

• "1 a (1): adapted to an end or design : suitable by nature or by art (2) : adapted to the environment so as to be capable of surviving..." (Merriam-Webster).
• "2 a : put into a suitable state : made ready... b : being in such a state as to be or seem ready to do or suffer something..." (Merriam-Webster).
• "3 : sound physically and mentally: HEALTHY" (Merriam-Webster).

There are many ways to get better at life.  My preferred workout programming is that of CrossFit.  If you haven't heard of them, you have a lot of reading to do, so click the link and come back to me later.