It is easy to learn asanas in a yoga session. Our body gets more flexibility after a few months of practice and postures get easier with time but physical lightness, strength and healthy neuro-muscular system could be achieved with any other physical training and is only a small path in yoga discipline.
Yoga! It is not just a way to exercise, but it helps to improve immune system too. This fact is known about Yoga throughout the ages. The exercising techniques and the various postures used to perform this kind of art are externally easy and can be done anywhere anytime. Some efforts to learn such exercises can actually pay in the long run. It helps to maintain body weight, body shape, decreases the probability of heart diseases like stroke and blood pressure and also helps in curing diabetes and asthma.