This article kind of made me laugh:
People on Twitter made a big deal this week about the fact that Christian ran routes with walk back recovery for conditioning.
"On my Friday, when my nervous system is pretty shot after the week (and) I've had three, four legit days of training, I'll do a max-out ladder of different routes with walk back rest. I'll march all the way down the field, every 10 yards, every 10, 15, 20 yards depending on the route, and I'll do that a couple times, and that'll be the most conditioning I do," McCaffrey says.
"It's obviously important to have a little speed endurance in football, but I've learned when I really condition myself hard, I feel myself kinda getting slower. And I'll probably rub a lot of trainers wrong saying that. But I started doing (this) last year, and I can honestly say there were very few times I felt tired during a game."
Two things to note.
1- Less is more and,
2- This type of conditioning has been call Metabolics and done in the NFL for decades. Mike Woicek ( Dallas) might have been developing position specific metabolic conditioning 30 years ago.
History repeats itself.