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I think it depends where you are in a repetition. Starting off is always too easy. But nearing the end your muscles should be starting to fatigue. If they arent; the weight is too light.
I know when I was lifting; I was going pretty quickly. But I am pretty sure the correct way to do it is to go slowly keeping the tension/resistance on the muscles and making them work harder and longer. The weights are not supposed to slam back onto the stack after each lift. Slow and steady wins the race. But then again everyone has their own way of doing things. If they are big and buff; they must be doing something right. But I think the muscle gets more of a benefit if you go slow and work it both up and down (or whatever direction you are going). I think jerking motions with the weights could lead to injury much easier. Jerking and shaky muscles could also be a sign that the muscles are fatigued or the weight/rep number is a little too high.
Hope this helps!
~Carrie
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"I'm not where I need to be, but THANK GOD I am not where I used to be! I'm OK, and I'm on my way!"
~Joyce Meyer~
Starting weight: (214 lbs)
Current weight: (188.3 lbs)
Total loss: (25.7 lbs gone)
Left to lose for goal 1: (48.4 lbs)
Left to lose for final goal: (68.3 lbs)
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