I'm reading along about the prospects and their different goals when I see this...
"Some players...need to gain weight. Others need to lose some, or convert body fat to muscle. Others need to rehab injuries or show the NFL their rehab is complete."
You CANNOT convert fat to muscle. Period.
Muscle and fat are two different types of tissue. You can't turn wood into stone, you can't turn plastic into metal, you can't turn a leg bone into a liver and you can't turn fat into muscle!
Unfortunately, this kind of misinformation is rampant. No wonder the average person doesn't get the results they want from their exercise program.