Heavy-Duty Rubber with Adjustable Height: 3 Adjustable heights for customized workouts. Ideal for achieving deeper squats, gentle physical therapy stretches, or targeted calf raises, all backed by ultra-grip rubber to prevent slips Protect Knees, Lift Heavier: Incline promotes knees-over-toes alignment, reducing joint strain. Dense rubber core stabilizes squats on grass/concreteideal for heavy weights or outdoor workouts All Fitness Levels & Needs: From rehab therapy to ATG squats: Beginners improve squat form, athletes boost depth, yogis stretch calves. Even physical therapists recommend for knee recovery Versatile for Squats, Stretches & Lifts: Transform from calf raise blocks to slant boards for hamstring therapy, or stack as deadlift platforms. Pair wedges for hip flexor stretches or elevated push-upsunlock 5+ exercises in one set Portable & Stackable Design: Durable with anti-slip material. Fits in gym bags for traveluse at home, parks, or gyms. Stacks neat