My boyfriend started a workout routine about a week ago. It seems to be helping him feel better although he's been tired and sore. He apologized for being tired which I didn't really care about. I just said it was no big deal. I hoped he felt better soon. He's always tired so it's nothing new, but he tagged on to that apology by saying, 'Well, yeah you know I'm trying to see if I can get some vigor back and help my libido.'