Forearm Plank Hold & Box Jump Work
Quick Intro
Forearm Plank Hold & Box Jump Work pairs two partners on two different exercises at once. One partner holds a forearm plank, working the core in near-total stillness, while the other does box jumps, working the legs and power in short, explosive bursts. When the jumper reaches an agreed rep target, the two of you swap. It is a hold-and-work pairing with unusually little in common between its two halves, which is part of its appeal.
For the full technique behind each half, see Plank and Box Jumps.
What You’ll Need
A sturdy box or platform that will not slide, set against a wall if possible, at a height the jumper can clear comfortably. A mat for the plank, placed a few steps away from the box and clear of the landing area. A timer or a way to count reps. Flat shoes with grip for the jumper and bare feet or shoes for the plank partner.
How to Do It Together
Holder. Place the elbows under the shoulders and the forearms flat on the mat. Lift into a straight line from head to heels, with the abdominals braced. Hold without moving until the jumper finishes, breathing steadily and not holding your breath.
Jumper. Stand in front of the box with the feet about hip-width apart. Swing the arms back, bend the knees and jump up to land softly on top of the box with both feet. Stand fully upright at the top, then step down one foot at a time. Aim for an agreed target, for example twelve reps. Exhale on the jump and inhale on the step down.
Swap. When the jumper reaches the target, the holder lowers to the knees and the roles change. Repeat for a second or third round if you like.
Quiet Hold, Loud Work
There is an obvious energy contrast in this pairing. One of you is lying almost still, working hard in silence, and the other is thumping up and down off a box. Some couples find that more engaging, for both the person watching and the person doing, than two quiet holds paired together.
The pairing also means the holder’s hold time is set by someone else. A slow jumper makes for a long plank, and a fast one makes a short one. Whoever is jumping should keep a controlled, steady pace and not sprint to rescue the holder. Rushing makes the jumps sloppy and the landings harder on the knees, and a plank that gets harder as it goes is part of the exercise. The holder’s job is to manage that, and the jumper’s job is to jump well.
Placement and space need a little attention, because the two activities do not share a rhythm. Put the box a few steps from the plank mat, so that a missed landing or a stumble never reaches the person on the floor. Never place the box where it could send the jumper toward the holder’s head or hands. Landing softly is as important as the jump itself. Bend the knees on landing and step off the box rather than jumping down, since stepping down takes the impact out of the repetition and spares the Achilles tendons and knees.
The plank has a simple warning sign. If the lower back sags or the hips pike upward, the hold is over and the holder should lower to their knees and swap with the jumper, whatever the count. That is not a failure. The hold ended when the form did. Equally, a jumper who feels any wobble in their legs should end the set early.
Roles trade so that each of you gets both the stillness and the burst. If you like the hold-and-work idea with a lighter second half, Plank Hold & Step-Up Work uses a step-up in place of the jump, and Side Plank Hold & Mountain Climber Work pairs a side plank with climbers. Box Jumps Set High-Five finishes a box jump set with a high-five.
Pairing a still hold with a jumping set means the two efforts feel very different to watch, and Working Out Together explains how to talk about uneven effort fairly.
If You’re at Different Fitness Levels
Assign roles by what each of you handles best: a still core hold or an explosive jump. A partner with solid core endurance but little jumping background can hold while the other jumps, and the roles can flip later with a smaller target. For couples still building up, the holder uses a knee-supported plank, and the jumper uses a lower box and a smaller rep target. Both scalings leave the format unchanged.
Safety and Consent
The holder should stop if the lower back sags. The jumper should step down from the box and not jump down, and the box should be stable and well away from the plank mat. Choose a height that you can land on with both feet comfortably.
Every connection moment in these exercises is something either partner can skip or scale back at any point, including this one, no explanation needed. The plank and the box jumps can be done separately, on your own time, if the pairing isn’t appealing.
FAQ
How do we decide who holds and who jumps? Base it on what each of you handles best, a still core hold or an explosive jump.
Why step down from the box? Stepping takes the impact out of every rep and spares the knees and Achilles tendons.
Where should the box go? A few steps from the plank mat and against a wall if you can, so it cannot slide.
What if the holder’s form fails early? They lower to the knees and you swap.
Do we switch every round? Yes. Trade when the jumper reaches the target.
Can I do a forearm plank or box jumps on my own? Yes. Plank and Box Jumps both work on their own.
Built on Plank and Box Jumps. Plank Hold & Step-Up Work and Side Plank Hold & Mountain Climber Work use the same hold-and-work format with other movements.