Today I did at home, sometimes I just feel like going slow. I have learned this extraordinary yoga asana in an Iyengar class in Oslo, and have never found it online or in any book.
It is for your shoulders, and if you stay in it for half an hour on each side it works wonders on your whole body. It is perfect to do in silence or play a meditation while you are at it.
It goes like this, lay down in savasana, raise both arms, grab around your elbows, right over left first, and then slowly let the arms god down behind your head. After the amount of time you choose do the opposite, left arm over right arm. Remember to breath, Ujjayi works fine here.
If you try it, please let me know how it went.