I did my dumbbell lunges in smooth-soled trainers just because they looked sharp: the day my back foot slid mid-rep, I understood what my knee had been taking
A slip during dumbbell lunges in slick-soled sneakers revealed a hard truth: your rear foot isn’t just balancing—it’s anchoring your entire kinetic chain. When it slides, every joint above scrambles to compensate, and your knee pays the price.