my placenta is towards the down near uterus, I mean Dr said that my baby is very down so take lot of precaution she said that I can sit on floor also... I want to join meditation classes so what can I do

If she has said so please avoid taking any risk. Mostly placenta moves up after few weeks. Take rest. You can join after some time. Low Lying Placenta: Facts You Should Know!

Please avoid sitting on floor.