Yeah, I concur with the weight training advice. My last effort with a higher volume lifting programme made me absurdly hungry, so on a sample of one(!) lower volume may be better once you've got the form down, despite the obviously lower calorie burn you get from less work.
I don't think running is really the way to go, though, as any injury can put you back weeks and destroy morale (cue comfort eating). Walking is an excellent idea, though. Hiking is a great family activity too, although expect to have your lad on your shoulders a lot until he's a bit older
![Smile :)](./images/smilies/icon_smile.gif)
I'm trying to get down to <75kg, so I can be a lightweight. I think I'll be a bit skeletal at that weight, but we'll see. From a food standpoint, I've gone cold turkey on all things sugary. Didn't help my training for the first week, but all good now, and I've lost a couple of kgs without having to try that hard.
An external motivator is usually helpful for me, so in the past I've challenged friends to a competition over who can lose the biggest % weight over a 12 week period. My challenge is not usually losing the weight: it's keeping it off, so this time, I've more or less decided that no more chocolate bars ever.
Good luck.