Urdhva Dhanurasana (Upward Facing Bow - this is NOT "wheel pose") is a quite difficult back extension pose but extremely invigorating, creating joy and energy in the body and mind.
When asked at one time how to prevent back pain in back extension, B.K.S. Iyengar replied, "simply create an equal amount of space between each vertebrae" (lol!)
However, he of course was right! If you imagine yourself as a bow being drawn and lengthen your spine like a rainbow then you will not experience any pain.
Below is a series using a bolster support, a wall and blocks which will help most people to get up into the pose.
A supported version on a "yoga" ball that is great for lower and upper back tension and breaking up depression.
And, naturally the master demonstrates a supported version that he could easily stay in for 20-30 minutes.