I assume, by fitness and exercise, you mean paying good money to go to a gym and doing whatever people do in gyms.
I never understood why people pay money to go to a gym and do physical labor that accomplishes nothing. It seems like a complete waste of time, energy and money to me unless one is training for a particular sport.
I have a better solution to your problem...
1 - Throw away your cell phone. It is making you into a retard anyway.
2 - Turn off your computer (except when it is paying your living expenses). Although I do allow myself a couple hours in the evening to "play" on the computer since it allows me to connect with other smart folks like me.
3 - Throw away your T.V. The Russians are infecting you with AIDS through it anyway and it will make your pecker shrivel up and fall off. How do I know this? Because I do not watch T.V. and I I still have a healthy pecker.
If you do those 3 things, plus quit paying good money to go to a gym, you are going to have a whole bunch of free time on your hands. If you direct that free time to actual productive physical enterprises, you will not only get into good physical shape but you will make the world a better place. Here are a few of my suggestions:
1 - Cut down a bunch of trees. Then cut and split them into firewood. Then go plant a couple hundred acres of corn, like my friend Smitty.
2 - String up 2 miles of pasture fencing like my good friend Slippy.
3 - Replace the transmission in an Apache attack helicopter like my old pal Denton. (On second thought, scratch that one. That requires intelligence and people die when you f$%& up.)
4 - Go over to Asscrackistan and kill a bunch of muslims like my good buddy OSFG.
5 - Build a house.
Pursuing any of the above mentioned enterprises not only makes you stronger physically, but they also increase you monetary net worth. (How does killing muslims increase your net worth? I'll pay you a bounty for every muslim left hand you bring back.)
Not only will these activities increase your net worth and make you physically stronger, you might also develop some calluses on your hands. You millennials may not know what a callous is, but is when you skin gets really tough from physical work, almost like leather. It means you will no longer get blisters from lifting a 10 pound bag of potatoes (or kale or whatever the hell it is you idiots eat now).
Kind Regards,
Your good ol' Uncle Inor