ProgreviaPec deck flyes
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How to do it
Set the seat so your arms are at shoulder height. Bring the arms together in an arc squeezing the chest and control the opening until you feel the stretch, without letting it snap back.
Muscles worked
Mainly pecho. Train it inside a balanced routine to progress safely.
Technical sheet
- Movement pattern
- Isolation
- Minimum level
- Beginner
- Technical demand
- Basic
- Fatigue it generates
- Low (0.6 out of 2.2)
- Risk if technique breaks down
- Low
- Peak tension in the stretched position
These are the values the generator uses to decide where the exercise goes within the session.
Recommended sets and reps
As an isolation exercise, it works best in 3–4 sets of 10–15 reps with 0–2 RIR. Use it at the end of the session to add volume without systemic fatigue.
Common mistakes to avoid
- Bouncing the bar or dumbbells off the chest instead of controlling the final part of the range.
- Using too much weight at the cost of technique and full range of motion.
- Doing reps too fast, without controlling the eccentric (lowering) phase.
How Pec deck flyes compares with other chest exercises
The catalogue has 18 exercises with chest as the main muscle group. Ranked from least to most fatiguing with the same values the generator uses, Pec deck flyes is number 2 (tied with 3 others).
That makes it a good candidate for adding chest sets at the end of a session or in heavy weeks, when you want volume without extra fatigue.
With different equipment, the same movement pattern offers 7 alternatives, such as Svend press, Cable crossover and High-to-low cable crossover.
| Exercise | Equipment | Fatigue | Technique |
|---|---|---|---|
| Svend press | bodyweight | Low (0.4 out of 2.2) | Basic |
| Pec deck flyes | machine | Low (0.6 out of 2.2) | Basic |
| Cable crossover | cable | Low (0.6 out of 2.2) | Basic |
| High-to-low cable crossover | cable | Low (0.6 out of 2.2) | Basic |
| Low-to-high cable crossover | cable | Low (0.6 out of 2.2) | Basic |
| Dumbbell pullover | dumbbells | Moderate (0.7 out of 2.2) | Needs coaching |
| Dumbbell flyes | dumbbells | Moderate (0.8 out of 2.2) | Basic |
| Decline dumbbell flyes | dumbbells | Moderate (0.8 out of 2.2) | Needs coaching |
Tension with the muscle stretched. Pec deck flyes loads the muscle when it is longest. In the review by Kassiano et al. (2023), across eleven studies, full range of motion and partials performed in the initial part of the movement — with the muscle long — produced more growth than partials performed at the end.
On a machine. In the meta-analysis by Haugen et al. (2023), with thirteen studies and 1,016 participants, there were no significant differences in muscle growth between training on machines and with free weights.
An isolation exercise. In the trial by Gentil et al. (2015), with untrained young men over ten weeks, the biceps curl and the lat pulldown were equally effective for gaining strength and size in the elbow flexors: isolation is not filler.
- Kassiano W, Costa B, Nunes JP, Ribeiro AS, Schoenfeld BJ, Cyrino ES. Which ROMs lead to Rome? A systematic review of the effects of range of motion on muscle hypertrophy. Journal of Strength and Conditioning Research. 2023;37(5):1135-1144.
- Haugen ME, Vårvik FT, Larsen S, Haugen AS, van den Tillaar R, Bjørnsen T. Effect of free-weight vs. machine-based strength training on maximal strength, hypertrophy and jump performance: a systematic review and meta-analysis. BMC Sports Science, Medicine and Rehabilitation. 2023;15(1):103.
- Gentil P, Soares S, Bottaro M. Single vs. multi-joint resistance exercises: effects on muscle strength and hypertrophy. Asian Journal of Sports Medicine. 2015;6(2):e24057.
Alternative exercises
- Dumbbell flyes
- Cable crossover
- Dumbbell pullover
- High-to-low cable crossover
- Low-to-high cable crossover
More Isolation exercises
- Band pull-apart
- Isometric calf raise on step
- Cable crossover
- High-to-low cable crossover
- Low-to-high cable crossover
Add it to your routine
Progrevia can generate a personalized routine that includes Pec deck flyes based on your level, goal and available days.
Build your Chest workout
Generate a full routine with the emphasis on Chest and Pec deck flyes among your preferred exercises. Free, no sign-up.
Not sure what to pick? The setup assistant walks you through it, one question at a time. Open the assistant
Frequently asked questions
What muscles does Pec deck flyes work?
Pec deck flyes mainly works the pecho muscle group, plus synergist and stabilizer muscles depending on the variation.
How many sets of Pec deck flyes should I do?
Between 3 and 5 sets per session, adjusting the total weekly volume for pecho to your level (about 10–20 sets per muscle per week).
Is Pec deck flyes good for building muscle?
Yes. Combined with progressive overload, good technique and enough rest, it's an effective tool to grow pecho.
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