Tekashi 6ix9ine is taking advantage of his time behind prison walls.

We recently reported that 6ix9ine was doing some butt-grabbing when his girlfriend Jade came to visit, and now there are reports that Tekashi is beefing up and eating healthier. 

On top of that, TMZ is reporting that Tekashi is writing and producing songs for his next album and that he even created visuals for the record.

Besides making music and working out, Tekashi is interacting with fellow inmates and listening to their life stories for inspiration.

Tekashi is still facing life in federal prison.