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Forearm Pronation/Supination with Hammer

Draftstrength85%beginner⬤ limited evidence
View FHIR resourceFHIR R4 ActivityDefinition — the interoperable form of this exercise

Positions & Range of Motion

Start
seated with the elbow braced on the thigh, forearm in neutral holding a weighted hammer or dowel vertically
End
hammer head rotated fully toward the floor (pronation) and toward the ceiling (supination), elbow staying pinned to the thigh
Range of Motion
full forearm pronation-to-supination, ~180° combined rotation about the forearm axis

How to Perform

Seated with elbow on thigh, rotate forearm using a weighted hammer or dowel. The offset weight creates torque for resisted pronation and supination.

Watch on YouTube↗

Opens a YouTube search for “Forearm Pronation/Supination with Hammer”

Equipment:hammer
Starting position: seated

Coaching Cues

  1. 1

    Quiet elbow — only the forearm rotates

    (verbal)
  2. 2

    Tilt the hammer head all the way to the floor, then to the ceiling

    (verbal)
  3. 3

    Move slowly through full range, both directions

    (verbal)
  4. 4

    Free hand on the elbow — it stays glued to the thigh

    (tactile)

Evidence-Based Dosing & EMG Data

Recommended Dosing

3×10-15 reps each direction

Muscles Involved (3)

Primary Movers

Pronator Teres— During pronation
Supinator— During supination

Secondary Movers

Biceps Brachii— Assists supination

Easier Variations ↓

1

Unweighted Rotation

Rotate the forearm without resistance, just focusing on full range.

Harder Variations ↑

1

Longer Lever

Hold the hammer further from the head to increase torque.

Target Movements (2)

Forearm PronationProximal Radioulnar Joint
Forearm SupinationProximal Radioulnar Joint

Why This Exercise Matters

Everyday activities this exercise helps you do — essential means it directly trains the capacity the task needs:

Opening a Jar

Goals This Helps With

Rehab, performance, prevention, and mobility goals this exercise supports — essential means it's a cornerstone:

Tennis Elbow (Lateral Epicondylalgia)rehab

Evidence Sources (4)