If you're the type of person who isn't ever going to be a morning exerciser, don't beat yourself up about it. Some people are jump-out-of-bed, birds singing, run-down-to-the-gym types. Some of us, on the other hand, will stay in bed until the last possible minute, before desperately chucking on some clothes and showing up to work 10 minutes late.
If you're one of the latter, you probably leave your exercise until after work. Which means that it probably gets shunted out of the way for more fun evening activities. Like the pub.
Consider, then, if you haven't already, fitting exercise into your precious lunchtime. Sure, it's a faff getting changed and showered and all that but, if it means you get your evenings back then really, it's not that big a deal.
Besides, there's like a million super-short, super-effective classes running at gyms all across the country now, catering to people just as morning-shy as you.