India, Jan. 11 -- When Tata Sons chairperson N Chandrasekaran steps up to the start line of the Tata Mumbai Marathon next Sunday, he won't be marking time alone. Nor will Mayank Kumar, co-founder of UpGrad and BorderPlus. Standing alongside them will be the men who push them to be the best runners they can be.

India Inc has fallen in love with running, turning out in ever-growing numbers for long-distance races rather than at golf courses. Yet the men and women who run corporate India admit they couldn't go the extra mile without their personal coaches.

So, who are the people keeping India Inc on its toes?

"I've been coaching Chandra since he started running in 2009, when he was COO of TCS," says Deepak Londhe, co-founder of Mumbai-bas...