Use a leg press for calf raises. You can even do unilateral assisted negatives that way: two legs to raise the load, one to lower; alternate legs until well done.
I think Arnie used to get several women to climb on his back for donkey calf raises? Not sure that was actually very effective but def worth a try if you can find the volunteers.
I think Arnie used to get several women to climb on his back for donkey calf raises? Not sure that was actually very effective but def worth a try if you can find the volunteers.