A 72-year-old VC who started running at 54 does 4 marathons a year. Here’s how he fits running into his busy workday. [Video]

The president of a New York investment firm struggled to fit exercise into his busy routine until he was in his 50s. Now 72, Greg Ho has run 43 marathons and plans to make that 100 before he turns 100.

After developing a slew of ankle and leg problems from judo and skiing as a young man, Ho’s fitness wasn’t what it used to be when he turned 54. He had very little time to devote to exercise due to what he described to Business Insider as his “high-stress job” as the president of Spring Mountain Capital.

But Ho said his wife told him he needed to be healthier and enrolled him in a cross-training program, like a boot camp, in 2008.

Around the same time, the Robin Hood Foundation, a New York charity that aims to fight poverty, asked Ho to run a marathon to raise money for them. He said he had already reached a decent …