Arnold says if you have 1 hour a day to spare, you can work out.

I also recommend lying to yourself. I already advocated for 5-minute workouts, which are great because the rest times in a traditional workout are a LOT of filler that you can remove; you obviously won't be able to lift heavy without any rest times but the training stimulus through sheer intensity will still be there. However, if you're having trouble dragging yourself to do 5 minutes, tell yourself you'll do it for just 1 or 2 minutes so you get SOMETHING done. There's a very good chance that you'll keep going for the full amount of time since you've already started.