# Standing 90/90 Dumbbell External Rotation

A standing single-arm rotator cuff exercise with the upper arm raised to shoulder height and the elbow bent 90 degrees. Turning the forearm from pointing down to pointing up trains the infraspinatus and teres minor.

- Beginner · Isolation
- Equipment: Dumbbells
- HD video: https://media.seto.fit/exercises/dumbbell-upright-shoulder-external-rotatio/video/male.mp4
- HTML: https://seto.fit/exercises/standing-90-90-dumbbell-external-rotation/

## Muscles worked

- Infraspinatus: 9/10
- Teres minor: 8/10
- Rear delts: 5/10
- Side delts: 4/10
- Supraspinatus: 4/10
- Traps: 3/10

## How to do the Standing 90/90 Dumbbell External Rotation

1. Raise one upper arm to shoulder height, elbow bent 90 degrees.
2. Start with the forearm pointing down, free hand on your hip.
3. Rotate the forearm up until it points to the ceiling.
4. Slowly rotate back down, keeping the elbow at shoulder height.
5. Finish reps, then switch sides.

### Full technique — 7 steps

1. Stand tall with feet about hip width apart, holding a dumbbell in one hand.
2. Raise that upper arm out to the side to shoulder height and bend the elbow to 90 degrees.
3. Start with the forearm pointing down and place your free hand on your hip.
4. Set your shoulders down and keep your elbow at shoulder height throughout.
5. Rotate your forearm upward until it points straight up, keeping the elbow angle fixed.
6. Lower the dumbbell back to the forearm-down position along the same arc.
7. Complete all reps on one side, then switch arms and repeat.

## Common mistakes

- Elbow dropping below shoulder height
- Opening or closing the elbow angle
- Shrugging shoulders toward ears
- Swinging the torso for momentum

## Form cues

- Elbow stays at shoulder height
- Elbow angle stays fixed
- Keep shoulders down
- Keep torso quiet

## How much to do

- **Strength**: 2–3 sets of 8–10 reps · rest 1 min · 3 reps in reserve · lower 3 s, pause 1 s, lift 2 s
- **Muscle growth**: 2–3 sets of 12–15 reps · rest 1 min · 3 reps in reserve · lower 3 s, pause 1 s, lift 2 s
- **Endurance** (good fit): 2–3 sets of 15–20 reps · rest 45 s · 4 reps in reserve · lower 2 s, pause 1 s, lift 2 s

Reps in reserve: how many more you could still do when you end the set.

## Where to start and where to go next

Same muscles, same movement. Too hard for now — step down; once it gets easy — step up.

- Easier: [Standing Mini Band External Rotation](https://seto.fit/exercises/standing-mini-band-external-rotation/) — Beginner
- **This exercise: Standing 90/90 Dumbbell External Rotation — Beginner**

## Quick answers

### What muscles does the Standing 90/90 Dumbbell External Rotation work?

Primary: Infraspinatus 9/10, Teres minor 8/10. Also works: Rear delts 5/10, Side delts 4/10, Supraspinatus 4/10, Traps 3/10.

### When should I do the Standing 90/90 Dumbbell External Rotation in a workout?

Warm-up. Done at the start to get the body ready. ≈ 7 min with rest.

### How many sets and reps of the Standing 90/90 Dumbbell External Rotation?

Strength: 2–3 sets of 8–10 reps, rest 1 min, 3 reps in reserve. Muscle growth: 2–3 sets of 12–15 reps, rest 1 min, 3 reps in reserve. Endurance: 2–3 sets of 15–20 reps, rest 45 s, 4 reps in reserve.

### What is an easier version of the Standing 90/90 Dumbbell External Rotation?

Standing Mini Band External Rotation (Beginner).

How we rate exercises: https://seto.fit/guides/methodology/

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