Carve Your Core With 10 Minutes of Cardio

This cardio move is great for runners; it not only works the lower fibers of the abs, but it helps train for quick turnover in gait to increase speed.

• Run in place while lifting your knees high to the level of your waist. Engage your abs as the knee comes up.
• Pump your arms to warm up your upper body.
• Keep running with high knees for 30 seconds.