Don’t underestimate a 10-pound dumbbell. They can challenge your body in an entirely new way, especially if you’re used to lifting heavy. Lighter weights target the small muscles that stabilize your joints—muscles that get overpowered by larger ones when you use heavier weights.
All wrong! For true results; 1) Bend at your hip (like a deadlift), keeping you're back straight. 2) Start position - your forearms are parallel to the floor. 3) Movement is extending the elbow so your hands touch your quads. 4) Slow controlled release up to start postion, this slow controlled released is needed to tear the muscle in order to re-build stronger.