Daniel is explaining how to properly set up the rack height for doing a barbell squat.
By the way as you look at the video, notice the plates in the background…these are Elieko[1]. Some of the best made plates and lifting equipment in the world used and certified by the IWF, IPF and World Para Powerlifting associations. This is typical Daniel Pare, go with the best you can afford.
Daniel Pare, N.C.C.P., C.S.O., C.S.P.S., C.S.T.S.
Strength and conditioning coach, Ontario Canada