Now, it could surely be argued that all yoga is anti-gravity in the sense that we work against it in postures - and practise our inversions in the probably vain hope that we can reverse gravity's ageing effects. But this wondrous system involves hanging from the ceiling in a fabric sling and then using the sling to support the body in stretches and extensions. Remember that old BBC ident with the ladies tumbling from the ceiling on red ribbons? Yes, just like that.
Given that I was born with a clumsy gene, I think I'll keep my yoga practice mat-bound.