I don't have any set routines. I'm 51, 6', 138 lbs. Thin by most standards. Preferred work out is obstacle race-like; carrying, pulling, pushing, climbing, dragging mixed into running. Ran 50 miles of mountain trails in 12.5 hours this past weekend. That was exhausting. Wanted a sub-12-hour time, but digestive problems slowed me down. Completed 932 pushups in 60 minutes in January. Was trying for 1,000 in one hour; trained with a 40 lb. pack leading up to that day. Blessed/cursed to be able to eat as many calories as I want and not keep the weight. More calories just turn up my metabolism.