Workout Plans : Stair Training Drills 101 – Jerson Fitness Personal Trainer Marin County, CA June 9, 2011, 4:44 am 2.1k Views Stair Training Drills 101 – Jerson Fitness Personal Trainer Marin County, CA Video Description Visit Keeping Marin County Fit Since 1997 Gym/Indoor/Outdoor/In-Home Training/Bootcamp Credits: Jerson Rodriguez … 19 shares