Set time markers for yourself. GET YOUR HEART PUMPING!
On any fourth to fifth minute—4-5, 9-10, 14-15, 19-20, and so on—push yourself…aim to get to a specific speed and maintain it for that full minute.
Example: You are on the elliptical going at speed 70. The timer hits 4:00. Push your speed to 90. MAINTAIN THAT. The timer hits 5:00. Bring your speed back down to 70. Voila.
Remember…sweat is sexy in the gym :).