Exercise is the great reveal. You don't need your your doctor to subject you to invasive exams.  Simply exercise and find tour weaknesses and fix from there. 

I started doing jumping jacks recently as part of my routine and I found out that my upper body does them fine almost like a teenager but my lower body--glutes, hip flexors, ankles needed the practice.  It's due to extended hours of sitting. 

Hip flexors are a group of muscles located at the front of your hips that allow you to lift your knees and bend at the waist. The main muscles in this group include the iliacus, psoas major, rectus femoris, and sartorius, which work together to facilitate movement and maintain stability.

HIP FLEXORS.

5 muscles that make up the hip flexors.  

The hip flexors consist of 5 key muscles that contribute to hip flexion: iliacus, psoas, pectineus, rectus femoris, and sartorius.