Ive done a year and half in prison
Getting big was easy
I gained 20 lean pounds in a matter of 5 months. Naturally
First off, half the guys who come in have never touched a weight or are strung out drug addicts (as was true for my case)
So they can rebound from that drug addict body to an average body pretty quick. (muscle memory, even if youve never worked out. your body has that ideal weight it wants to be. so if its surpressed by drugs it will bounce back fast.)
Second... if you have money on your books... food is easy in jail.
You can buy almost anything off Commissary.
Packets of tuna,
Peanut butter,
Oatmeal,
Juices or packets of teas and juices.
If you get a job in the kitchen or your cell mate works there,
you can get extra servings of the good shit.
So on top of the 3 meals a day you can also trade and barter other ppl for their meals.
Alot of ppl are on medicines and crazy drugs and shit. So you could trade them some bullshit nutty bars for their whole tray.
You get plenty of sleep
You get CAN get plenty of food
We had a weight room in the one prison
The other 2 I was in, they didnt,
So we made due...
Squats with guys piggy backing on your back
Curls with laundry bags full of heavy books
Trash bags full of water
We had large tupperware kinda storage boxes in the one place,
we would empty out and fill with water.
Shit probably weighed 40-50 lbs when filled to the brim
Throw that on your back and do some pushups. See how much of a burn you get.
Pull ups with someone pulling on your legs.
Core work galore
Its def possible.
Its amazing how smart ppl get when they have nothing else to do and they get bored.
My first bunch of stretchmarks started in jail. Due to various push up routines I did everynight. Diff sets, reps, intensities.
Honestly... jail/prison saved my life. I got off drugs, and started my life long trip into fitness... all due to doing my time.