Yoga is not just about flexibility although modern practise seems to lay greatest emphasis on it.the perfected body is not the goal. It is how expansive our consciousness becomes... how inclusive.Ultimately the body forms only the vehicle where the eternal consciousness within journeys to Samadhi.
this can occur only with the inner limbs of yoga..viz. pranayama,pratyahara, dhyana and dharana, with the withdrawal of the sensory perceptions in the breathless state.