Whether you're using dumbells or a weightlifting machine, you aren't doing yourself any favors by cheating. So make sure that for every rep, you complete the full range of motion for the exercise.
If you're using free weights, this means returning to your starting position after every rep: If you're doing bicep curls, lower you hands all the way down and bring them all the way back up. To get the most complete range of motion when using a weight machine, you should lower the weight so it almost touches (but doesn't quite touch) the weight stack below.
If you're not sure what the range of motion should be on a particular exercise, ask a trainer at your gym.
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Exercise is fundamental to my happiness. There have been plenty of days when my husband asks me in his sweetest voice if I need to go for a run. Maybe he should be asking me if I want to lift weights.
Rowing is a great exercise for the upper back and there are so many 
