@dustydoesmobility: Taking stairs two at a time used to be nothing, and now the second flight is where the legs start negotiating. The Step Up and Knee Drive plants one foot on a box, presses through that heel to stand, and drives the back knee up to the chest, building single leg strength in the glutes and quads while the hip flexors and balance get trained on top. 8 to 10 reps each side. Save this. Subscribe for daily mobility and strength. #stepups #kneedrive #singlelegstrength #glutes #balance