True renunciation has nothing to do with asana practice

There is no profit in simply controlling impulses. A cobra becomes harmless only when its fangs are plucked out; similarly, the roots of impulses must be burned. Only then can the aspirant attain the Brahman. Of course, even pure desires are a bond. But they are not hindrances, however many they may be. A thorn is removed by another and both are thrown out afterwards, right? So also, when impure impulses are overcome through the influence of pure impulses, one has to outgrow both. This means that even the purest of impulses, the craving for liberation, has to disappear in time. Only then, can you become Brahman. A shackle is a shackle, whether it is of iron or gold. That is to say, one should attain a stage when neither good nor bad will attract or repel. Anyone aiming at the realisation of God should practice the diminishing of impulses, the curbing of the mind, and must strive to understand the fundamental principle of Divinity.

Sri Sathya Sai Baba