Muscles that flex major joints are the key focus of this “NASM Podcast,” where listeners learn exactly which muscles are responsible for flexing the shoulder, hip, elbow, and knee, as well as how to distinguish between primary and secondary movers at each joint.In this clear, anatomy-driven review, host Rick Richey breaks down functional anatomy to answer the question: "What muscles flex the body's major joints and how do they work together during movement?"
Early in the episode, Rick identifies the specific muscles that perform flexion at each joint, such as the anterior deltoid and clavicular head of the pectoralis major at the shoulder, the iliacus and psoas major at the hip, and the biceps brachii and brachialis at the elbow. He also explains the importance of synergy among muscles, how tight flexors can impact joint stability and pain, and how secondary and smaller muscles assist the primary movers.
Listeners will come away understanding both the anatomical details and practical implications for training and client assessment.Those interested in deeper dives or advanced concepts can learn about the NASM-1 platform, where further content and interactive AMA sessions are available for trainers and coaches.
Chapters:
[00:01:00] What does it mean for a muscle to flex a joint in anatomy?
[00:01:24] Which joints are considered major for flexion?
[00:02:26] How do you determine primary versus secondary movers?
[00:03:04] Which muscles flex the shoulder and why?
[00:05:03] Do both heads of the biceps brachii flex the shoulder?
[00:07:09] Does the serratus anterior flex the shoulder or just aid movement overhead?
[00:09:41] What are the main muscles that flex the hip?
[00:10:18] Does the psoas major connect to the spine or the pelvis?
[00:11:49] How can weak stabilizers contribute to low back pain during hip flexion?
[00:13:06] Which secondary muscles also flex the hip, and what is their role?
[00:14:09] How do muscles like sartorius and TFL contribute to hip flexion and movement?
[00:16:44] Which muscles flex the elbow, and what makes some more important than others?
[00:18:52] What muscles flex the knee, including both the hamstrings and secondary movers?
[00:23:03] What is the pes anserine complex and how does it assist with knee flexion?
[00:24:18] How do minor muscles like the popliteus contribute to knee flexion?
[00:24:53] Where can listeners go for advanced NASM anatomy content?
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The content shared in this podcast is solely for educational and entertainment purposes. It is not intended to be a substitute for professional advice, diagnosis, or treatment. Always seek out the guidance of your healthcare provider or other qualified professional. Any opinions expressed by guests and hosts are their own and do not necessarily reflect the views of NASM.
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