Stand upright holding a medicine ball at chest height. Step forward into a lunge with one leg while simultaneously curling the medicine ball up toward your chest, engaging your biceps. Push through the front heel to return to standing and lower the ball back to chest level, then repeat on the other side. Maintain an upright torso and core tension throughout.
Log your medicine ball lunge with biceps curl sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.