Back extensions using the pelvic sling & the Viparita Dandasana backbender (Whale).

Supported Sarvangasana on two large cork blocks - mimicking spike work - into Dwi Pada Viparīta Daṇḍāsana supported.

Viparita dandasana supported on a Yoga Tressler

Back extensions using yogaarts.nz:

Pelvic Sling + Viparita Dandasana bench.