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Jumping jack counter

Face the camera, get your whole body in frame and start jumping. Each jack counts when your arms come up and your feet go out, then back together.

Counting runs in your browser. Camera video never leaves your device, and nothing is recorded or stored.

How to set it up

1. Prop your phone or laptop at about waist height, 2 to 3 meters (7 to 10 feet) away, facing you.
2. Tap Count with camera and allow access.
3. Step back until your hands above your head and your feet both fit in the frame.
4. Jump. Each jack counts when you come back to the start.

What counts as a rep

The counter scores how open your "star" is: wrists above your shoulders and feet wider than your hips. A rep counts when you go from closed to open and back. Small half-jacks with low arms won't count, and fast jacks are fine.

Tips

• Leave space above your head in the frame. Hands that go out of view can be missed.
• Bright, even light helps the camera see your arms and feet.
• Land softly on the balls of your feet with knees slightly bent.
• For a quiet version, step out to the side instead of jumping. Bring your arms all the way up.

Jumping jack workouts

• Warm-up: 30 to 50 jacks before any workout.
• Quick cardio: 100 jacks as fast as clean form allows. Your reps per minute show below the counter.
• Ladder: 10 jacks, 5 squats, 5 push-ups, and repeat five times.

Questions

More free tools

• Squat counterCounts squats with your camera, front or side.
• Push-up counterCounts push-ups with your camera, from the side.
• Physiological sighDouble inhale, long exhale. Cyclic sighing.

Have the same tool on your iPhone

RepOut turns the moment an urge hits into a short drill: breathing, push-ups, squats and more, with the camera counting your reps and a streak that grows every day.

Get RepOut on the App Store