As a lifelong weight/power lifter I agree with bedell.I was a solid 245 when I got back into dirtbikingAfter 3 laps on a mx track I was trashed!I have since gotten down to 220 by running "ins and outs".Walk 30 seconds,then jog 30 then sprint 30 then start over.Weight wise,4 sets 2x a week doing:high rep(15-20)low weight bench,deadlifts,power cleans and FULL squats.I also bike for fun.I feel better,have more energy and can ride much longer and still have good muscle mass.I wish I had done this 20 years ago!Best of luck,ACES 2