jump squats are really handy, get a light weight on a barbell or even just a barbell to get used to it, you squat as normal then as you preload down, jump up calmy and controlled to start off with then as you get into it try as hard as you can and even put weight on the barbell if your getting around a foot of the floor, this really helps for jumping on the bike and warms you legs up for heavy normal squating and calf workouts.
also a good core exercise would help and tricep training as you can get some powerful frenchies on the bike.