Adding dumbbells to your sweat session will build some metabolism-boosting muscle. This circuit workout, full of multitasking moves, is incredibly effective for toning your entire body in little time. frugal fitness tips, thrifty fitness tips
Stability Ball Back Extension. Lie facedown on a stability ball, hands behind your head, feet against a sturdy object. Squeeze your glutes and lift your torso up until your body forms a straight line. Hold for one or two seconds.