Lie on an incline bench. Again, no incline angle is better than the other. Each produces slightly different motor unit recruitment and thus they all should be used. Choose one and stick with it for a training cycle. Take two dumbbells and hold them with a supinated (palms up) grip. Let your arms hang naturally down from the bench without losing tension on the musculature. Using your elbows only, curl the weights up as high as possible while maintaining tension on the musculature. Bringing the weights too high in arm curl exercises takes the tension off the elbow flexors and decreases their effectiveness. Lower the weights under control to the start position.
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The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.