Nairobi, May 9 -- Kimani Macharia weighed 150 kilos the day he walked away from his second well-paying job in less than a year.

He doesn't look like that man anymore. He sports an impressive, lean and chiselled body that is hard to miss. Towering at 6 feet 2, he now weighs 85 kilos, thanks to a not-so-common fitness regime.

We met him at the VMX gym in Nairobi. He lands thunderbolt Muay Thai knee strikes into a hanging bag with the kind of force that could perhaps shatter a bone. It is hard to picture that he is the same man who was barely able to move under his own weight a few years ago.

When he resigned for the second time, he had only recently returned to Kenya from the US.

"I thought the change of scenery would make things better...