High-intensity interval training works by alternating hard bursts of effort with short recoveries, keeping your heart rate elevated while you move through a variety of exercises. A weighted ball you hold and control is ideal for this because it adds resistance to every rep without asking you to throw, slam, or chase anything across the room. Every movement below is gripped, braced, and deliberate — which keeps your form tight even as fatigue sets in.

How this 20-minute HIIT workout is structured

The session uses a simple work-to-rest ratio: 40 seconds of work, 20 seconds of rest. You will move through a circuit of six exercises, resting briefly after each, then take a longer break before repeating the circuit. Three rounds gets you to roughly 20 minutes including warm-up.

Keep the ball at a weight you can control for the full 40 seconds. If your form breaks down before the buzzer, the ball is too heavy — that is exactly the kind of adjustment an adjustable medicine ball is built for, since you can drop from 16 lb to 12 or 8 lb between rounds in seconds. Not sure where to start? Our guide on what weight medicine ball to choose walks through it.

Change the load between rounds

The 8 lb core ball plus a 4 lb or 8 lb band covers 8, 12 and 16 lb. The bands seat and lock in seconds, so scaling down mid-session costs you part of a rest interval, not a trip to a rack.

The six-move circuit

Perform each move for 40 seconds, then rest 20 seconds before flowing into the next. All of them are held and controlled — grip the handles, brace your core, and move with intention rather than momentum.

1. Goblet squat

Hold the ball at chest height with both hands and squat until your thighs are roughly parallel to the floor. Drive through your heels to stand. The load in front pulls you into a tall, upright torso and lights up your quads, glutes, and core.

2. Overhead press

From chest height, press the ball straight overhead until your arms are extended, then lower under control. Squeeze your glutes and keep your ribs down so the work stays in your shoulders and not your lower back.

3. Russian twist

Sit with knees bent and heels light on the floor, holding the ball just off your chest. Rotate your torso to tap the ball toward one hip, then the other. Move at a steady, controlled pace to keep the tension in your obliques.

4. Reverse lunge with the ball at chest

Hold the ball at your chest and step one leg back into a lunge, lowering until both knees are bent about 90 degrees. Drive back to standing and alternate legs. The added load challenges your balance and single-leg strength.

5. Woodchopper

Stand tall, hold the ball to the outside of one hip, then sweep it diagonally up and across to the opposite shoulder, rotating through your trunk. Control the return. This trains rotational power without any release of the ball.

6. Ball halo

Hold the ball by the handles and circle it slowly around your head, keeping your core tight and hips still. Reverse direction halfway through. Halos build shoulder stability and a rock-solid midline — a perfect finisher before you rest.

Tips to get the most out of it

Breathe on a rhythm rather than holding your breath through the hard reps — exhale on the effort, inhale on the return. Spend the 20-second rests actively resetting your grip and stance so you are ready to move the instant the next block starts. And treat the longer 60-second break between rounds as real recovery: sip water, shake out your arms, and let your heart rate dip so you can attack the next round with clean form.

If 40/20 feels brutal early on, scale it back to 30 seconds of work and 30 of rest, or run two rounds instead of three. As your conditioning improves, add a round or bump the weight. For dozens more held-and-controlled movements you can swap into this circuit, browse our full exercise guide, and if you want a bigger-picture plan, the medicine ball workout guide ties it all together.