1.  Uphill sprints place less impact on the joints that regular sprints, as well as create greater type 2 recruitment, thus sparring, or even, building muscle!   2.  I talk about WHERE to buy grass-fed/finished beef.  butcherbox.ca is a good start but the most cost effective is a simple google search.   3.  Rest/Pause training is where you take a set to failure at 6-10 reps; wait 15 seconds; do another few reps to failure; wait 15 seconds; etc....until you can just barely squeeze out 1 rep.  This is a variation of Heavy Duty training made famous by Arthur Jones, Mike Mentzer, and 6 time Mr. Olympia Dorian Yates.