Skip to content
Handler
Exercise database

Jab-Cross Intervals

Jab-Cross Intervals is an intermediate cardio exercise that primarily trains the shoulders and core, with the calves and hips assisting. Equipment: bodyweight.

Library data updated IntermediateBodyweight

What this page is: structured data from Handler's own exercise library — the same cues, mistakes, ranges, and modifications the coach uses in the app. It is general exercise information, not an individual technique assessment or medical advice. Stop any movement that causes pain and seek qualified coaching or clinical care for injuries.

Demonstration loop from Handler's exercise library. Only the still frame loads until you press play.

Technique

Form cues for the jab-cross intervals

  1. 01

    Set the intensity so you can match the target RPE for the full block.

  2. 02

    Keep your posture tall and your breathing rhythmic.

  3. 03

    Adjust speed, incline, resistance, or cadence before form breaks.

  4. 04

    Punch at RPE 7-8 for short rounds while keeping the chin tucked and shoulders relaxed.

Troubleshooting

Common mistakes

  • Starting above the target RPE.

  • Letting posture collapse as fatigue builds.

  • Ignoring the recovery pace on intervals.

Programming defaults

Sets, seconds, and rest by goal

These are the starting ranges Handler's library assigns to the jab-cross intervals for each training goal. They are defaults the coach adjusts from your logged sets, not a prescription for any individual.

GoalSets × secondsRest between sets
Strength6 × 20–40 s1 min 20 s
Hypertrophy8 × 20–45 s1 min
Fat loss10 × 30–60 s45 s
General fitness6 × 30–60 s1 min

Between sets

  • Let your breathing come down before the next interval.
  • Use the recovery pace on purpose.

Working around discomfort

Modifications by body area

How Handler adjusts the jab-cross intervals when a lifter reports a sensitive area. These are training modifications, not treatment. Pain that persists or worsens needs clinical assessment.

Shoulder
Use a pain-free range and keep the upper arm path controlled.
Wrist
Use a neutral wrist position or reduce loading until the wrist stays quiet.
Neck
Keep your gaze neutral and avoid shrugging into the neck.

Progression chain

Easier and harder variations

Progress to

This is the most demanding step in its chain.

Questions about this exercise

What muscles does the jab-cross intervals work?
The jab-cross intervals primarily works the shoulders and core. The calves and hips work as secondary or stabilising muscles. In Handler's library it is classified as a cardio movement.
What equipment do you need for the jab-cross intervals?
None. The jab-cross intervals is a bodyweight exercise, which is why it appears in Handler's anywhere setups.
How many sets and seconds of the jab-cross intervals should I do?
Handler's default for a strength focus is 6 × 20–40 s with about 1 min 20 s rest, and for a muscle-building focus 8 × 20–45 s with about 1 min rest. These are the library's starting ranges, not an individual prescription; the coach adjusts them from what you log.
Is the jab-cross intervals suitable for beginners?
It is tagged intermediate. A simpler starting point in the same progression chain is the bodyweight cardio burpees.

More shoulder exercises

Invited TestFlight beta · iPhone-first

Let the coach program the jab-cross intervals for you.

Handler is our product. In the invited iPhone beta, the coach places exercises like this one into your plan, sets the starting ranges shown above, and adjusts them from the sets you log. Test build, not a public download.

Request beta access