Lacking Motivation or Rest?

From USAT

(Editor's Notes: An excellent article looking at the question 'Is it fatigue or motivation?'. Here is the take home summary but I encourage you to read the whole article.)

Start warming up and see how you feel 5 to 10 minutes into the workout. If you feel better and forgot you were tired, then you probably just needed to harden up! If you feel worse and/or that you cannot maintain proper form, then take it to the house with no guilt and focus on rest and recovery.