Start in Conducive Rest Pose, bring knee into chest and allow leg to oscillate with the breath, note the opening and closure of the inner elbow joint. This connects movement with breath and allows the hip joint to soften. Then strap foot and take to straight (think bent knee straight leg).
Do not lock the joint. Reach through heel to create dynamic connection from floor to heel. Activate a muscle by moving it toward inner shin.
There are many variations of where the strap should be on the foot and how to hold the strap.
Release all tensions in surrounding areas, then whole body into the mat.
Work at your edge to keep focus, become curious, map the breath into the smallest parts of the body.
Rule no1: yoga teachers always do the first side longer 😉 know your self and start with the leg the needs most time.