B.K.S. Iyengar began practicing yoga at sixteen at the insistence of his brother-in-law, Tirumalai Krishnamacharya. He was malnourished, chronically ill, and so physically compromised that he couldn't stand upright without effort. Krishnamacharya needed a student to demonstrate poses for a visiting dignitary and chose Iyengar largely because he was available.

Iyengar practiced. He was not good at it. He was stiff, weak, and uncoordinated. Krishnamacharya, by multiple accounts, was not gentle about this. But he gave Iyengar a practice calibrated to what Iyengar could actually do, not the advanced forms Krishnamacharya was teaching to stronger students, but a modified version designed for a body that was starting from very little.

Iyengar practiced that modified sequence every day. Within months his health began stabilizing. Within years he had developed a sophisticated physical practice. He went on to teach yoga for seventy years, write books that remain the definitive instructional texts in the field, and train teachers across six continents. He was teaching until months before his death at ninety-five.

The first time Iyengar came to Krishnamacharya's school, he couldn't hold a standing pose. That was not considered a reason to wait.

Patanjali's instruction in the Yoga Sutras is sthiram sukham asanam; the posture should be stable and comfortable. He wrote this in a text concerned with meditation, not physical performance. The postures existed so that the body could be in a stable, comfortable position for extended sitting. Stable meant grounded and not falling over. Comfortable meant free from strain. Deep, impressive, or photographable were not on the list.

The flexibility prerequisite for yoga is a modern Western fitness category. It was applied to the practice when studios started marketing yoga as physical fitness in the 1980s, and it has been causing unnecessary barriers ever since. Flexibility is not the entrance requirement. It is one of the outputs of consistent practice. Waiting until you're flexible to start yoga is the logical equivalent of waiting until you're fit to go to the gym.

What happens in the body when you practice before you feel ready.

The nervous system, not the connective tissue, is the primary limiter of range of motion in most people. The muscle spindles send protective contraction signals when they detect threat. Slow, sustained, breath-synchronized stretching with consistent practice teaches the nervous system that increased length is safe. The range opens not because the tissue changed dramatically, but because the nervous system updated its threat model. This takes weeks, not days. Consistency is the variable that matters.

The connective tissue does change over time, but slowly. It responds to low-intensity sustained load repeated over months. You cannot accelerate this with intensity. You can only show up consistently and let it adapt.

The practical instruction: start with whatever you can actually do. Three sun salutations done slowly with full breath is a complete practice on day one. The modification is the practice, not a lesser version of it. Krishnamacharya taught this explicitly: yoga must be adapted to the individual, not the individual to yoga.

The body you have right now is exactly the body the practice was built for. You don't need to prepare for it. You start.