Loss of workout energy/motivation

This past week or so, I haven't had the same energy I have as before while working out (I have taken some days off as well, seeing if I just have over worked myself). Yesterday I went and just didn't have the same energy or fire to lift or workout. I am not sure what it is, but just a concern because I want to continue my progress. Any suggestions of what I could to do help out?
Loss of workout energy/motivation
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