A wall-mount squat rack could be built on a concrete floor with about 24' of 3" wide channel steel, a couple of 1-1/4" dia x 4" long capscrews with two nuts each, some concrete expansion anchors, some lag bolts, some 1/8" 6013 rod and a cheapo stick welder. Add another dozen feet of channel to make the rack freestanding. Buy from a scrapyard. Have a metal shop punch a row of holes up the vertical members' webs on 4" centers.
Typical construction work and house chores don't give the range of motion needed to get strong legs and back.
Mr. Battue nailed it. If I'm doing work sets of squats with a bodyweight barbell when I'm in my late 50s and 60s, I'll be a happy camper.
