This adjustable dumbbell set converts into dumbbells, a barbell, a kettlebell and a push-up stand, supporting bench presses, squats and other home training. The weight plates have an outer PE shell filled with cement and sand, which helps protect floors from scratches, and their textured surface makes handling and stacking easy. A thick steel tube connecting rod wrapped in high-density foam has an ergonomic curved shape that rests comfortably against the body, with a non-slip, sweat-absorbent and breathable feel for longer sessions. The dumbbell bar carries a textured non-slip surface for firmer grip and steadier control during strength training. Reinforced locking nuts with thickened threads hold the plates firmly to limit wobbling, while detachable plates allow flexible weight adjustment, simple assembly and compact storage.