I used to play running back for 7yrs, partly in highschool & college.
I was about 225lbs or so at 5ft10 but it took about 6-7yrs of training & dieting to reach that point as I started training at 15yrs old.
Anyway as for training our routines contained mostly compound movements & power movements.
Many of our rep scheme was kept between 3-6 reps for our sets with no high repetitions.
3-5 sets of flat bench or decline bench press & 3-5 sets of incline bench press, some days we added dips & incline DB flies but not all the time. Much of the time our chest workout was fast.
Biceps we did 3-4 sets of barbell curls & 3-4 sets of hammer DB curls
Triceps was either 3-4 sets of flat bench or incline bench close-grip & either 3-4 sets of barbell skull crusher tricep extension or 3-4 sets of cable push down
Legs was easy, 5 sets of squats parallel to the floor, 3-4 sets of leg press, 3 sets of stiff leg deadlifts for hamstrings, 3 sets of lying hamstring curls & 3-5 sets of toe presses for calves
Back focused mainly on lots of barbell rows.
But we started out with 3-4 sets of weighted wide grip chin ups, 6 sets of barbell rows, 3 sets of a varied cable row, & 4 sets of either deadlifts or hyper extensions with weight & 3-4 sets of rear delt flies, why they made us do rear delt flies on back day I'll never understand.
Shoulders pretty basic, 2 sets of seated military press to warm up, 2 sets of standing military press 3 sets of front delt raises, 3 sets of side delt raises, 3 sets of each side of your neck using a neck machine, & 5 sets of either barbell or dumbell shrugs for traps
& other days we'd inlcude various forearm exercises.
That was just the weights
But for conditioning & speed was different.
We did tons of plyometrics including box jumps, ski jumping side to side, the rope & tire jumping, jump rope & even long jumping Olympic style.
We'd run many 20 & 40 yard dash sprints with & w/o a parachute strapped to your back, wall climbing & some days there would even be 3-5 of us who'd take out the biggest van or suv that one of us had & we'd all sit in it while one guy pushed the van or suv up & down a parking lot for 100yards at a time.
Then there was off season training programs that included many of these routines.