| | Conditions & Treatments | Muscle Strains What is an example of a flexor muscle? The biceps brachii muscle is an example of a flexor muscle. It is located at the front of the upper arm and is responsible for flexing the elbow joint. Muscle Strains - Related Articles How to Strap a Knee Injury Consistent Hamstring Pain Torn Hamstring Repair How to Use Epsom Salt in a Jet Tub Icy Hot Instructions The sensitivity of muscle spindles to stretch can be adjusted by? Why do you need to stretch all the time?