Diamond calves, one heel at a time.
Keep your knees soft but straight, drive the movement from your ankles.
The standing calf raise machine loads you through the shoulders with your knees straight, which is precisely what makes the gastrocnemius, the big visible calf muscle, do the work, it only pulls its full weight when the knee is extended. Dropping the heels below the platform loads the calves in a deep stretch before every rep, and the machine path means all you manage is the ankle. It is the staple for calf size for a simple reason, nothing else isolates that stretch-to-full-contraction range as cleanly.
Standing with straight knees trains the gastrocnemius, the muscle that gives the calf its shape. Seated with bent knees shifts the work to the soleus underneath. For complete calves you eventually want both, but standing is where the visible size lives.
Usually bounced half reps. Lower to a full stretch, pause there for a second to kill the rebound, then drive to full height and squeeze. Slow reps through complete range change everything for calves.
They recover quickly and are used to daily work from walking, so two to four sessions a week is fine for most people. Frequency plus full range beats one heavy bounce-fest a week.
