Especially if he doesn't have a good technique, which he probably doesn't as he's doing it all by himself. He's heavy for a runner and this won't be fun for his joints. But I think it's great, we all know this is just a phase and his interest will shift again once the 'shine' wore off, just like he used to go biking all the time, then he was renovating or gardening all day. But at least he does something productive with his days, it's just too bad neither of the two can obsess with being good, involved and active parents. Their newest fads always serve themselves, what they want and enjoy, it's never: oh, let's do something for the kids and take them to museums, parks, zoos, theatres, and so on.
And by the way, it's also a sign that neither of them are working to capacity, if they would have real jobs instead of just filming their children and edit for 30 min, they wouldn't have the energy to obsess about themselves so much.
He is still doing the IF'ing though, right? So they have dinner early, Anna goes to bed, he hits the snacks and wine, and then has to wait until about 13:00 before he can eat. He then has a large cooked breakfast every day and a small dinner. Rinse, repeat.
It's far from healthy, especially if he is exercising every day and as much as he claims (doubt he runs as fast, think he takes his bike and then runs, but still...).
It looks to me like he's been 'influenced' by Anna's regime and is now heading towards ED behaviours himself. Those poor kids.....
I don't think he's been influenced by her, I think it's her who's in danger of being influenced by him. She sees him being 'better" than her at losing weight, and I don't think she's the person who can take that and be happy for him. I really don't worry about Jonathan, like I said, this is a fad and unlike Anna's ED, it will pass, his drinking however seems to be persistent.
But you're totally right, the poor kids will be completely messed up by this, it's a constant competition in this household and they're being taught that unless they're better/the best, they're not enough. The constant am I your best friend, who do you love more, who's your favourite and so on. Combined with the bullying, ADD, ED, narcissism, depression and everything else the parents are in the process of handing down to their kids, it's heartbreaking.
Those kids may live in a grey mansion, but thanks to their parents they're probably at a higher risk of mental illnesses than most kids growing up on an estate.