Climbing stairs instead of taking the elevator is a great way to add quick bursts of exercise to your day, and here's a new twist on stair stepping: When climbing up, take the stairs two at a time. The effect is like combining the StairMaster and lunges. Really focus on the back of your leg and your booty as you climb. Think of your hamstrings and glutes pushing you up, rather than your quads pulling you up the stair. I think it feels great, but if you feel it in your knees you might just want to give this move a miss.
When it comes to taking the stairs, don't forget there are benefits to going down them as well!