Barbell Triceps strength and lockout

JM Press

JM Press exercise demonstration

The JM press blends a close-grip bench and a skullcrusher. The bar travels down toward the upper chest with elbows tucked, making it a powerful triceps builder for lockout strength.

Muscles Worked

Primary Muscles

  • Triceps

Secondary Muscles

  • Chest
  • Anterior Deltoids

How to Perform

  1. 1

    Setup: Lie on a bench with a close grip and wrists stacked over elbows.

  2. 2

    Lower: Bend elbows and lower the bar toward the upper chest/neck line under control.

  3. 3

    Keep Elbows In: Elbows track forward, not flared.

  4. 4

    Press: Extend elbows to return to the start without bouncing.

  5. 5

    Repeat: Use controlled, moderate reps.

Common Mistakes

Too Heavy

JM press is technical; lighter loads work best.

Elbows Flared

Flaring turns it into a bench press.

Bar Too Low

Lowering to mid-chest strains elbows.

Bouncing

Stay controlled to protect joints.

Training Notes

JM Press responds best to strict form and a stable elbow. Keep the upper arm fixed and let the elbow joint do the movement. A neutral wrist reduces strain and helps the biceps or triceps stay the prime mover throughout the range.

Use a controlled eccentric—about 2–3 seconds down—to build more tension without swinging. If you need momentum, the load is too heavy. A brief pause at the top can improve peak contraction and make lighter weights more effective.

For hypertrophy, 3–4 sets of 10–15 reps is a reliable zone. For strength, work in 6–10 reps with longer rests. Arms usually recover well, so you can include an extra isolation set at the end if form stays clean.

If elbows get irritated, reduce volume and keep the wrist neutral. On triceps movements, avoid letting the elbow flare too wide. On curls, keep the shoulders back and avoid rolling them forward as the weight rises.

Pair JM Press with a movement that trains the opposite function—curl with extension, extension with curl—to keep the elbow balanced. Over time, small rep increases and improved tempo are better indicators of progress than chasing heavier weights every week.

Use a full, pain‑free range and keep the shoulder joint quiet. Many lifters get better results by slightly reducing load and slowing the reps. Consistency and clean technique build thicker arms faster than occasional heavy swings.

Grip changes can emphasize different fibers. A neutral grip often hits brachialis and forearms, while a supinated grip biases the biceps. Rotate grips across the week to keep the elbows healthy.

For triceps work, keep the upper arm pinned and avoid letting the elbows drift forward. The goal is elbow extension, not shoulder movement. A small pause at full extension helps you feel the contraction.

If forearm pump limits curls, lighten the load and slow the tempo. That keeps tension on the target muscle and reduces grip fatigue.

Keep volume moderate and spread arm work across the week if recovery is an issue. Two focused sessions often beat one very long session for both quality and elbow comfort.

Programming & Progression

Most lifters grow best with arm training 2–3 times per week using moderate loads. Use 8–15 rep ranges for most sets and a slower tempo to keep tension on the muscle. A quick pump set at the end can add volume without heavy stress.

Keep total arm volume in check if pressing and pulling volume is already high. If elbows feel beat up, swap in cables or bands for a few weeks. The goal is consistent tension, not maximal weight.

A simple progression is to add reps first, then small weight increases. Track the quality of the last 2–3 reps; if they get sloppy, reduce load and rebuild. Clean reps build bigger arms than forced swings.

Pro Tips

  • Start with EZ Bar

    More wrist-friendly than straight bar.

  • Keep Forearms Vertical

    Better triceps leverage.

  • Use 6–12 Reps

    Great for strength and size.

  • Superset with Pushdowns

    Full triceps pump.

Variations

EZ-Bar JM Press

Less wrist stress.

Dumbbell JM Press

Independent arms.

Floor JM Press

Shorter range for elbow comfort.

Smith Machine JM

Stable bar path.

Alternatives

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