Two sets of each exercise with a weight that produces muscular failure in 15 to 20 reps.
Execute slowly and without stopping in the middle of the set.
Make the upward phase last about 1 second and the downward phase 2 seconds.
Rest 1 to 2 minutes between sets.
Begin with a total weight equal to about 25% of body weight and progress up to 50% (never more).
Press straight upward with your palms maintaining a forward-facing position. As your arms become straight, squeeze your hands slightly inward until the dumbbells touch end-to-end.
Gist: straight elbows instead of bent elbows.
Grip the bar with your hands shoulder width apart. Many pull-down machines possess bars designed for the much wider hand position preferred by bodybuilders — do not use this wide grip.
Gist: hold the grips with the overhand grip and lift it straight up to the collarbone.
Possible with the cable machine.
Gist: the upper arms should remain stationary and only the forearms should move.
Gist: soft elbows + control the motion and do not swing the weight.
Gist: never lock the knees during the extension.
Gist: perhaps skip due to increased risk of injury to knees?
Isolation exercise for hamstrings. Yummy.
Gist: need more info in regards to the safety of these machines.