Calves: “6 minutes in Hell”

On the seated calf raise, put a 25-35 pound plate.
Starting only with the right leg, do a single leg calf raise for 60 seconds non stop.
At 60 seconds you switch to the left leg immediately and repeat.
After that 60 seconds you immediately switch back to the right leg for 60 more seconds.
* You will alternate back n forth for 6 minutes straight, 3 minutes each leg.
ZERO rest