I think it's probably best to work out in the morning to get it out of the way. My ultimate top tip is to drag yourself, even if you have to roll yourself out of your bed and in to a sit-up - it's really not that bad once you start.
“If you can write DNA, you're no longer limited to 'what is' but to what you could make.”
“I've had a few arguments with people, but I never carry a grudge. You know why? While you're carrying a grudge, they're out dancing.”