No worries brother.
One thing though.Make sure it is the really soft sand,the type when u go to walk your feet and sliding and trying u are trying to keep from not falling over.
I think my growth came from just the diffeerent angles i was pushing on each leg,a standard calf raise is up and down but with snad sometimes your feet slide in one direction and then another.
Being a whisker under 250 probably helped heaps
The bad thing was after i done my walks i jumped straight in the ocean for a swim,about 10 mins later i got some major fucking cramps in my calves(not good when in the water)
I managed to paddle my way back to shore