Eccentryx / Exercise Atlas / arms
JM press
Bench setup; bar angled toward face (bench × skull crusher hybrid); elbows ~45°.
Muscles
- Primary
- triceps
- Supporting
- chest, front delts
Mechanics
- Pattern
- elbow extension
- Equipment
- barbell
- Geometry
- Variable Range
- Energy model
- Glycolytic Pathway (10-90s)
- Target feel
- Tricep stretch at bottom like skull crusher; press force like close-grip bench.
- Progression
- Load once form is consistent; combine with board press for lockout.
- Regression
- Close-grip bench press as the strength base before JM.
Watch for
- Bar path too vertical — becomes close-grip bench, loses the hybrid angle
- Excessive elbow flare — shifts load to chest unnecessarily
- Too heavy — triceps fail explosively; use moderate load with control
Substitutions
- Close-grip bench
- Skull crusher
- Cable pushdown