Filmmaker Sudhir Mishra is currently on an all-time high. Ever since the 53-year old filmmaker discovered Hot Yoga he has begun to feel the change, espeically in his grey hair, which has begun go back to black.

"I wouldn't have noticed it if my friends hadn't pointed it out. My hair has gone white for years. But now I see it's going back to being black. Initially, I didn't believe it.

But yes, slowly my hair's greying process is being reversed," said Mishra known for directing films like "Hazaaron Khwaishein Aisi" and "Chameli".

Hot Yoga, also known as Bikram Yoga, was introduced by Bikram Choudhury in the 1970s and one has to do exercises under hot and humid conditions. Sudhir recommends it as the most effective form of exercise.

"Ever since I began to practice it I feel a change in me. The hair is just the most noticeable part of it," he said.

Interestingly Mishra's wildly-flowing whitened mane has been an integral part of his personality for years now.

"The weirdest thing is, some of my friends think I've finally started dying my hair because it's suddenly looking blacker than before. I tell them I've started applying hair dye selectively," he said.

Mishra is part of the small circle of showbiz folks who refuse to dye their prematurely grey hair. Vikram Bhatt and Sriram Raghavan too refuse to dye their hair although it's gone grey from the time they barely entered their 40s.

Among the actresses Waheeda Rehman and Jaya Bachchan refuse to colour their hair, arguing when you dye your hair, you are fooling no one except yourself.

Maybe they should try Hot Yoga.