I know from sad experience that if I started doing 50 pull-ups and 100 push-ups per day that I would flare up a case of bursitis and tendonitis from Hell. That's the work-out Waterbury is suggesting today. I know that my body just can't handle that volume, but a newby/oldster might not and find out the hard way. I seem to be able to handle intensity and heavy (for me) weights, but a large volume aggravates my tendons, bursa, and joint capsules.
I have found it is better to quit lifting while still feeling strong, and come back another day. Often enough I hurt the next day anyway. We mature lifters have nothing to prove to anyone but ourselves.