Watch 30 Minutes to Fitness Strength and Stamina (1970) : Full Movie Online Free Kelly Coffey-Meyer’s 30 Minutes to Fitness "Strength & Stamina" includes two workouts that are designed in a new and energizing format. The only equipment needed for both full-body workouts are dumbbells and a kettlebell (a dumbbell can also be used as a substitute for a kettlebell, if needed). These one-of-a-kind workouts will increase your strength with dumbbells, slim down your waistline with kettlebell swings, and take you to a more advanced fitness level with its non-stop flow of various back-to-back exercises.