What muscles does Machine Chest Fly work?

Machine Chest Fly trains Chest as primary movers (counted as 1.0 hard set per set) and Shoulders as secondary synergists (counted as 0.5 hard set per set).

What is Machine Chest Fly called in French, Strong, and Hevy exports?

In French gym logs and Strong/Hevy CSV exports, Machine Chest Fly also resolves cleanly from Machine Chest Fly.

Machine · CHEST

Machine Chest Fly — Muscles Worked & RPE Load Guide

FR: Machine Chest Fly · High output close to 0 RIR with minimal CNS tax

Machine Chest Fly targets Chest as primary movers (1.0× set credit) alongside Shoulders (0.5× synergist credit). Cam-matched resistance across sticking points.

Primary Movers (1.0×)

Chest

Full 1.0 hard-set credit per set

Secondary Synergists (0.5×)

Shoulders

Fractional 0.5 set stimulus

Equipment & Pattern

Machine

External / Standard Load

CSV Import Aliases

Strong, Hevy, Capua & Jefit

17-Muscle Fractional Recruitment & Weekly MEV–MRV Landmarks

Each working set ≥ RPE 6 triggers fractional hard-set credit toward Renaissance Periodization / Schoenfeld weekly hypertrophy landmarks.

Muscle Group	Mechanical Role	Effort Share	Weekly Optimal Band (MEV–MAV)	Frequency & Research
Chest (Pectoralis Major)	Primary (1.0× set)	85%	10–20 sets/wk (MRV 22)	2–4x / week · Evidence
Shoulders (Deltoids)	Secondary (0.5× set)	15%	8–22 sets/wk (MRV 26)	2–6x / week · Evidence

Machine Chest Fly Worked Wathan RPE Prescription Table (kg)

Worked kg values computed for Machine Chest Fly using a worked 115.0 kg reference 1RM (Machine) rounded to 5 kg machine increments. Mechanics: Externally braced cam track; resistance curve: Cam-matched resistance across sticking points.

Reps	RPE 9.5	RPE 9	RPE 8.5	RPE 8	RPE 7
3 reps	0 kg (87%)	0 kg (87%)	0 kg (87%)	0 kg (83%)	0 kg (83%)
5 reps	0 kg (83%)	0 kg (83%)	0 kg (78%)	0 kg (78%)	0 kg (78%)
8 reps	0 kg (74%)	0 kg (74%)	0 kg (74%)	0 kg (74%)	0 kg (70%)
10 reps	0 kg (70%)	0 kg (70%)	0 kg (70%)	0 kg (70%)	0 kg (65%)
12 reps	0 kg (70%)	0 kg (65%)	0 kg (65%)	0 kg (65%)	0 kg (65%)

Strong, Hevy & French/English CSV Import Labels

STRUGGL automatically maps these exact workout-tracker strings to canonical Machine Chest Fly volume and e1RM records on zero-login Wrapped CSV upload.

Machine Chest Fly butterfly butterfly machine ecartes machine pec deck pec deck machine pec fly machine seated chest flys

Taken-Rack Substitutes & Biomechanical Swaps

Ranked deterministically by weighted primary-muscle overlap inside the same measurement family.

Around The World (100% overlap) Cable Fly Crossovers (100% overlap) Cable Low Fly Crossovers (100% overlap) Compare Swap: Machine Chest Fly vs Cable Low Fly Crossovers →

Verified Peer-Reviewed Literature (PubMed & DOI)

Peer-Reviewed Paper	Author & Journal	External Reference
Specific prime movers' excitation during free-weight bench press variations and chest press machine in competitive bodybuilders.	Coratella (2020) · European journal of sport science	PubMed 31397215 ↗
A comparison of muscle activity and 1-RM strength of three chest-press exercises with different stability requirements.	Saeterbakken (2011) · Journal of sports sciences	PubMed 21225489 ↗
The effects of ten weeks resistance training on sticking region in chest-press exercises.	Saeterbakken (2020) · PloS one	PubMed 32645111 ↗

17-Muscle Fractional Recruitment & Weekly MEV–MRV Landmarks

Machine Chest Fly Worked Wathan RPE Prescription Table (kg)

Strong, Hevy & French/English CSV Import Labels

Taken-Rack Substitutes & Biomechanical Swaps

Verified Peer-Reviewed Literature (PubMed & DOI)

Compute Your Exact Machine Chest Fly 1RM & Weekly Muscle Volume