Walk into the garage and turn right. Walk into the doorway on the right and stop just inside the fitness room.
Turn right and go into the garage. Turn right and go into the room. Wait there.
At the bottom of the stairs, take the first right and enter through the doorway. As soon as you are in the garage, continue to the closest door which should be on the right hand side. Enter through and you'll find a room that has a exercise machine, gym mats, a table, etc and that'll be your destination.