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Marcy JD-3.1 Setup and the 45-Degree Bench This Program Uses

The Marcy JD-3.1 has a flat hip pad on one post and two foam leg holders on an upright post behind it. Marcy's back-extension photo shows the body level with the floor at the top and the torso hanging straight down at the bottom. That is the vertical 90-degree kind of Roman chair, and the program on this site is not written for it. Marcy lists no angle setting for it.

What Marcy lists

Why the angle decides it

On the 90-degree chair your body is level at the top of every rep, so the top is the hardest point. At the top of a 45 your upper body sits out only about 70 percent as far past your hips as it does when level, and Stage 1 holds there. A 15-second hold on the JD-3.1 is harder, and the program has no number for it. The 45 vs 90 guide covers the difference.

If you already own one

Start with Floor Foundations while you find a 45-degree bench at a gym or for home. Each round is a prone hold, 6 bird-dogs, and 8 glute bridges; the first session is 3 rounds with 10-second holds and 60 seconds of rest. The buying guide covers what to check on a 45.

Setting up the 45-degree bench

The top edge of the pad sits just below your hip crease, where your thighs meet your pelvis. Your hips rest on the pad, so your back can round on the way down and straighten on the way up. Too high and the pad presses into your stomach; too low and you slide forward. Move it one hole at a time with nobody on the bench.

Check the maker's user height range if it gives one. If not, test the lowest setting (short users) or the highest (tall users) on your body inside the return window.

Set the ankle rollers snug against the back of your lower calves, just above the heel, with your feet flat on the foot plate. If your feet go numb during a hold, stop and recheck the setup.

Wobble check before the first session:

• Every foot touches the floor, and the frame does not rock when you push it.
• Every pin and knob is fully seated. Pull on each one.
• Frame bolts are tight, and tight again after the first week.
• If it folds, the fold lock is closed and stays closed when you press on the pad.
• A slow body-weight hold at the top, hands on the handles, moves nothing.

First session on the bench

Stage 1 is 3 holds of 15 seconds at the top, with 60 seconds of rest. Hips on the pad, arms crossed on your chest, hold still leaning slightly forward from the hips, neck neutral, no bouncing. If you start in the app on the bench, its setup questions may set your first session at 10, 15 or 20 seconds a hold. The first-week guide covers the morning log, and the progression guide covers all four stages.

If pain shows up in your legs, stop the extension work, do not add load, and read the red flags.

Low Back Pain Coach sets each next session from your pain log the morning after.

The app