Good afternoon!
Just a note of caution!....you do not want to mess up this fusion this early in the game, and live to regret it posibly the rest of your life....so please be very careful. Walking is the best form of exercise and the safest so far. I would think that a gentle swim might be good...but again be careful.
While your fusion has a decent start, it is not complete by a long shot. I cannot help you with what a spin is...maybe another member will know.
Good luck...but again...be careful...and wait until you get a good solid green light for any normal activity.
Take care,
SE