Not painful at all to lean or lie on, despite how it looks!The Acupressure mat I looked at on Amazon looks like an awful contraption. That's seriously not painful?!
This is the one I have HQ Acupressure Massage Mat and Pillow + carrybag Set - Relieves Stress, Back, Neck, and Sciatic Pain / Yoga Yantra Nailmat Green ECO https://www.amazon.co.uk/dp/B01HQIWN1C/ref=cm_sw_r_cp_apa_i_tJHqCb283K0CC