NikkiRoux:
because Soviets is not considered canon by many
That's a very odd statement – why would it not be canon? And why "many"? How was the survey done?
I've never seen anything to say that, since it's re-release in 1989 it isn't any more or less accepted as canon, and since it was re-re-released in the uniform binding with the glossy cover and perfect binding it's definitely part of the regular series! But that's drifting off, although it might make an interesting independent thread some time.
To get back on topic, I think the suggestion by mct16 that Jean-Pierre Talbot is pretty good as an indicator of what a real-life Tintin could look like.
However, to rainise I'd suggest that using a cartoon character as a goal for your body-shape and condition is not the best way to go: as far as can be told Hergé didn't bother to see
if Tintin as he drew him, and the physiology and physics added up, so to look like Tintin does doesn't mean that you could perform physically as he does.
You also can't control how your height, build, weight and health would work towards getting a shape like Tintin has, and to try to do so might in fact be unhealthy for you.
It would seem more sensible to take advice on healthy exercise and diet, appropriate to you, and to seek the guidence of a sports-teacher, or someone at a gym, to see if you can work on your physique to a level which would give you good all-round fitness.