Exercise
Butterfly: How to Do It, Muscles Worked
The Butterfly is a beginner-level strength exercise that primarily works the chest. It uses machine, and is performed in 5 steps, following the form cues, common mistakes and sets/reps guidance below.
What muscles does the Butterfly work?
The Butterfly primarily targets the chest, with no listed secondary muscles in the dataset. It's classified as a beginner-level strength movement using machine.
What are the most common Butterfly mistakes?
- Cutting the stretch short at the bottom instead of feeling a full stretch across the chest.
- Letting the shoulders roll forward instead of keeping the chest up through the movement.
- Bending the elbows into a press instead of keeping a fixed, slight elbow bend through the arc.
- Using a weight heavy enough that the shoulder joint — not the chest — ends up limiting the set.
How should I program the Butterfly — sets, reps and frequency?
As a single-joint isolation exercise, it responds well to a higher 10-15 reps for 2-4 sets, usually taken close to muscular failure. It tolerates higher frequency than a heavy compound lift — twice a week for the same muscle group is common. Add small amounts of weight or an extra rep once every working set can be completed with good form — the same progressive overload principle behind every strength exercise in the library.
What are good Butterfly variations and alternatives?
- Dumbbell Flyes — dumbbell, beginner level, chest
- Flat Bench Cable Flyes — cable, intermediate level, chest
- Incline Cable Flye — cable, intermediate level, chest
- Incline Dumbbell Flyes — dumbbell, beginner level, chest
| Attribute | Value |
|---|---|
| Level | Beginner |
| Equipment | Machine |
| Category | Strength |
| Primary muscles | Chest |
| Secondary muscles | — |
How to do the Butterfly, step by step:
- Step 1. Sit on the machine with your back flat on the pad.
- Step 2. Take hold of the handles. Tip: Your upper arms should be positioned parallel to the floor; adjust the machine accordingly. This will be your starting position.
- Step 3. Push the handles together slowly as you squeeze your chest in the middle. Breathe out during this part of the motion and hold the contraction for a second.
- Step 4. Return back to the starting position slowly as you inhale until your chest muscles are fully stretched.
- Step 5. Repeat for the recommended amount of repetitions.
Key takeaways
- The Butterfly is a beginner-level strength exercise using machine.
- Primary muscles worked: Chest.
- A typical working range is 10-15 reps for 2-4 sets, usually taken close to muscular failure.
- The most common technical fault is cutting the stretch short at the bottom instead of feeling a full stretch across the chest.
Log the Butterfly in your next workout
Try IRONSLOG freeFrequently asked questions
Is the Butterfly suitable for beginners?
Yes — the dataset lists the Butterfly as a beginner-level movement, though anyone new to training should still start with light weight (or no added weight) to learn the pattern first.
What equipment do I need for the Butterfly?
A machine. No other equipment is required for the standard version of this movement.
What's the difference between the primary and secondary muscles listed?
Primary muscles (Chest) do most of the work and are usually the limiting factor in the set. Secondary muscles assist or stabilize but aren't the main driver of the movement.