Exercise tip of the day

8. Triceps kickback 
The faux pas Swinging your upper arm, dropping your opposite shoulder, trying to lift your arm and the weight too high behind you The facts When you make any of these mistakes, your triceps aren't sufficiently challenged, and you also may place stress on your shoulder and elbow joints.

The fix Hold a dumbbell in your right hand and stand to the right of the long side of a bench, feet hip-width apart or in a staggered stance. (You also can kneel on the bench with your left knee.) Flex forward at hips at about 90 degrees, and place left hand on bench for support. Keeping torso stationary, bend right elbow so upper arm is parallel to ground and forearm is perpendicular to ground, palm facing in. Position elbow close to waist and contract abs. Keeping upper arm still, use triceps to straighten arm behind you until end of dumbbell points down (shown). Slowly bend elbow to return to perpendicular position. Strengthens triceps

9. Crunch
The faux pas Jerking your neck, not lifting shoulders, failing to engage abs The facts These mistakes will result in a sore neck, and your abs won't get any firmer.

The fix Lie on your back with knees bent and feet flat on mat, hip-width apart. Place hands behind head, thumbs behind ears, fingers unclasped. Hold elbows out to the sides. Contracting abs, draw hips and lower ribs together, keeping buttocks relaxed. Without pulling on neck or drawing elbows in, curl up and forward, keeping head and neck relaxed as shoulder blades lift off mat (shown). Hold, then slowly lower back down. Strengthens abdominals