There are muscle gaining mistakes that can affect anyone of any age that lifts weights, and then there are those that are even worse when you get to be 40 years old. In this video, I’m going to show you the 8 biggest muscle building mistakes that you can make and how they are amplified when you get to be a little older. The first is the warmup. This one is tricky since many people forget to warmup at all when they are getting ready to lift weights. On the other hand, those that turn their warmups into wor
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