You just need to find something that you like doing and doesn't feel like a chore. For me it's soccer - I would play every day if given a chance (too bad that my wife wouldn't agree with that though). It's so much fun that I play even if I'm injured and know I shouldn't.

I also go to the gym 4-5 times a week. This is harder to get into. What works for me is going over lunch time. It's a 10 minute walk to my gym and I spend about 35-40 minutes there lifting weights. I would probably go less if I had to go after work as I am usually tired and I have a 40 min commute. If you're looking into starting to lift weights I recommend doing StrongLifts 5x5 - It's beginner friendly.