The hack squat calf raise is a variation of the standing calf raise performed in a hack squat machine. This allows for heavy loading, but also shoulder comfort from the pads of the hack squat. Calf raise variations are often performed for relatively high reps, such as 10-20 reps per set or more.
Builds size in the gastrocnemius
Great burnout on leg day
Simple to alter tempo or add pauses to increase difficulty