What exercise can i do now that i'm out of cast from a small fractured right ankle (i was out for four weeks)?

i fractured my right ankle playing soccer my doctor said it was a very minor fracture and i was in a soft cast for four weeks i got it off monday and my doctor said i can play sports again on friday or saturday but is there anyexercisee i can do to get my strength and speed back fast? Thanks (also when i played soccer agin i still couldn't run and i still somewhat feel pain in certain movements)