I too work full time. I'm up at 5:20 am, drop kids off at daycare at 7, work 8-4, pick kids up from daycare, get home at about 5:20 (depending on traffic), cook dinner, eat, put kids to bed at 7:30-8:00 pm.
It's very difficult to find the time. To make it easier, DH and I split up the nightly tasks of kids and kitchen. That way we are both done at around the same time. Then, we workout together, hop in the shower quickly, and watch an episode of something on tv. It's crazy hectic, but we make it work.
Some things that have made it easier are to make very simple dinners (scrambled eggs and toast, Mac n cheese, stir fry with pre-cut veggies, etc.). That way there are less dishes and clean up to do. Also, if I feel pressed for time, I just do a short video. Finally, if I really just don't feel like it, then I don't do it.
Amanda - happily married wife to N
and mother to B