Sit in a 45-degree sled/leg press machine with your back supported and place the balls of your feet on the lower edge of the platform, allowing your heels to hang off. Keep your knees mostly straight but not locked. Lower your heels slowly to feel a deep stretch in the calves, then press through the balls of your feet to raise the sled by extending your ankles only. Pause briefly at the top, squeezing your calves, then lower under control back to the stretched position. Repeat for the desired reps while keeping movement controlled and avoiding bouncing.
Log your sled 45 calf press sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.