WHITE SULPHUR SPRINGS, W.Va. — The wonderful sight of John Mara, progressing in his cancer battle, watching his Giants practice on Day 2 of training camp and interacting with John Harbaugh’s players, was inspiring for the revered owner’s new $100 million head coach.

“I think when you talk about the New York Giants, you talk about their legacy, you’re talking about the ownership line,” Harbaugh told The Post. “John Mara, he’s been doing this for how long? Many, many years, and not just since he’s been in that position in terms of running the organization.

“But his whole life. His whole life has been the New York Giants. He grew up with it. It’s in his DNA. It’s in his blood. I know how that is because my dad [Jack is] a coach. You live it when you’re 3, 4, 5 years old right on through every single day. And he’s that kind of a guy, he’s a football man. He’s been around it since he can remember, and you can see it, the wisdom and the judgment, the decision-making and all that.”

Mara, clad in white, standing on the side at the start of practice, was impossible for anyone affiliated with the Giants to miss.