Loads of good stuff above. I like the saying 'the yang is rooted in the yin'. The heavenly branches can only go as far as they are supported by the earthly roots. The spirit shouldn't - or perhaps can't - extend beyond the body's ability to support it. So the body should be grounded and nourished to support a healthy energetic experience. Or something like that.
Anyway, squats. The answer is more squats.