No gym? No problem. Use this high-intensity circuit to raise your heart rate and engage your deep stabilizers. Perform 3–5 times per week for a tighter, flatter midsection.
1. High Knees

Jog in place, driving knees as high as possible. Keep your core tight and arms moving with control.
60 SECONDS
2. Chair Twists

Sit tall, hold a light object, and rotate your torso side-to-side while keeping your back straight.
3 SETS x 20 TWISTS
3. Box Jumps / Step-Ups

Jump onto a sturdy surface, landing softly with both feet. Step down with control.
3 SETS x 10 REPS
4. Mountain Climbers

From a high plank, alternate bringing knees toward your chest quickly. Keep hips low.
3 SETS x 20 REPS
5. Plank Scissors
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In a forearm plank, raise legs slightly and open/close them in a controlled scissor motion.
10–15 REPS
6. Knee-to-Elbow Cross

Lie on back. Lift shoulders and bring one knee to the opposite elbow in a rhythmic motion.
20 REPS TOTAL
7. Side Plank Twists

In a side plank, lower and lift your hips. Add a reach-under twist for extra intensity.
4 SETS x 10 PER SIDE