Warning: that tack strip trick from the supply house guy wrecked my knee
I mean, he swore by using the knee kicker at a steep angle to save time, tried it on a 12x15 living room last Tuesday and my patella is still sore. Anyone else had a bad tip from a sales rep they regret following?
and honestly, I get the frustration, but I gotta say the angle was never the problem here. I've been kicking at a steep pitch for years and my knees are fine, but the trick only works if you're shifting your weight through your hips, not slamming down with your quads. Most guys hear "steep angle" and just crank the tension up, which is exactly how you blow out a patella. The sales rep gave you a shortcut, sure, but it sounds like the real issue is your form, not his advice. Maybe take a week off and watch a few videos on body mechanics before you blame the guy entirely.