21/12/2025
🎄 Anatomy Advent Day 21 - The Hamstrings 🎄
In horses, the term “hamstrings” refers to a group of powerful muscles on the back of the hind limb and rump. They are larger and more complex than in humans because they drive propulsion and support the horse’s weight.
The main muscles included are:
•Biceps femoris
•Semitendinosus
•Semimembranosus
⚙️ Function
The hamstrings are essential for:
•Hip extension – pushing the hind leg backward
•Stifle (knee) flexion
•Propulsion – powering forward movement
•Collection and engagement in ridden work
•Stability of the hind limb during weight-bearing
Without strong hamstrings, a horse cannot move efficiently or powerfully.
Well-developed hamstrings are critical for:
•Jumping
•Dressage (collection, sitting, impulsion)
•Racing and speed work
•Trail and hill work
•Quick acceleration and turns
They are a major contributor to what riders call “engine power.”
Hamstrings are prone to injury because of their size and workload. These can include:
-Strains or tears (often from slipping or overexertion)
-Tying-up
-Soreness from poor conditioning or imbalance
-Secondary tightness due to back or pelvic issues
Signs of hamstring injury/soreness may include short stride, reluctance to engage behind, stiffness, or asymmetrical muscling.
