Not at HT yet (still on BT2), but for me, I'm pretty spent after my workout. However, since I tend to workout in the morning, I feel like I could and should do something later in the evening. It may just be that I'm restless and need to go to bed, but the feeling's there.
Off days are the same. Feel like I should be working out more, even though I know that recovery is really important. Would a bit of metabolic work interfere with the recovery?
Lagrub, I've always done better with a second exercise bout on my workout days, vs. trying to do some training every day. I'm not even talking about something intentional. I'm talking about a couple hours of yard work in the evening after lifting at lunchtime, or a couple hours of running around with my daughter's soccer team, back when I used to coach.
Here's my best guess at why it works: Even an hour or two after I lift, I still feel like everything's running faster. And then if I add more physical activity on top of that, I think the metabolic effect of the workout is extended much longer than it otherwise would be.
Conversely, if I work out every day, it feels like the metabolic effect is muted. The off-day workouts aren't that good, so I'm probably not burning as many calories, and I doubt if I'm creating any sort of EPOC effect.
Just guesses, of course. I could probably structure a workout program that would test all this, in an n=1 fashion (100% broscience!), but ... nah. Old dog, new tricks, etc.