Running- I love taking quick jogs before or after dinner, usually around 6 when the sun is setting. Nothing is better than watching the sunset while you sit cold water after your run!
Kickboxing- It's a great stress reliever and a great quick and high intensity workout. Perfect if you're just having one of those days where nothing goes 100% right.
Steps- I love this mini stepper from Gaiam! It's the perfect size to store when you don't need it. I slide mine into the back of my closet when I'm done with it.
Pilates- Pilates is my favorite core workout. I always do at least 10 minutes of Pilates daily, after my yoga.
Yoga- Every single day, I look forward to my yoga sessions in the afternoon. My sessions are 30-50 minutes, and they are incredibly easy to do anywhere, even on vacation. All you need is a tried-and-true routine and some yoga music (I just put on a long Yoga music video on Youtube). A mat is good too, but optional when on-the-go.