With any sort of wrestling your main concern will be stamina (endurance + strength). Static holds with push/pull power included. As with football, when you want to get and keep the game legs ready, you have serious practice workouts. Same with wrestling, where actually wrestling in training is number one. And more likely on a daily bases.
I know nothing, or heard, about PL69's degree of wresting. Sounds like semi Pro small town/market style. I do know that ultimate fighters/MMA (and such) do a lot of bwt exercises (personal witness). Something along the lines of Hindu/Dive bombers push-up's, regular push-up's, squats, lunges, step-ups, etc. Including bridges and ab work. Not talking 3X12 reps. More like 100's of reps during a training session. Might PL69 consider these, in such higher reps, to improve his performance in the squared circle. If he is doing these already, than PL69 might consider approaching them with more serious intent. Also doing hill/deep sand running, 40's and stair running is outstanding.
PL69 should have a trainer or coach to advice him on getting in shape by training the correct way and to avoid injuries. Sounds like he does not. Wonder if he is a freelance player? Most of those guy's do not have insurance or medical benefits. Tough way to earn food on the table considering the risk taken and the small amount of money earned. Good Luck anyway.