FitnessTogether.com/BaskingRidge Billy Beyer, owner of Fitness Center and Physique Competitor Sifu Slim, author/speak/coach Plank Levels How to sit in a chair — chest up, shoulders back, plant your back against the chair. Maintenance vs. Performance Shape Once per week fitness or running — Weekend Warrior Maintenance is a challenging concept for some. One should think of one goal to get fit and develop a new goal to sustain fitness. Please subscribe. More videos every month. Books available on Amazon. Search SIFU SLIM