33yo trying to make up for 5 years of office living

Hello.

I'm a 33 year old male, living in London, working in a pretty standard cube farm. I haven't been an athlete since my early twenties, and I'm under no illusions that I ever will be again, but I do want to shift the extra*extra* weight that has crept up on me since starting on my current sedentary career (I used to work in an industry that had me on my feet and active for 14-16 hours a day)

My stats are:

Age: 33
Height: 6'0" / 183cm
Weight:: c.125kg (although I'm waiting for my scales to arrive, so that's the upper end of a guesstimate - might be as low as 117kg, but I doubt it...).

I'm aiming to shift a few stone primarily to feel healthier, but also to feel more comfortable being active or in a gym environment, and to feel a bit more confident (although that's not really much of a problem for me). The usual, I suppose!

My biggest problem has never been that I can't shift weight, it's that I struggle to stay motivated once I start to see results - I get complacent. I don't know whether using the app or this site will help, or how, but it's worth a shot.

I have a target weight of 105kg, which would be about level with the lightest I've been since I was 25. By way of context, I was regularly running sub-60 minute 10k's when I weighed about 110kg a few years ago, so I know that at 105kg I would feel great.

I've set myself a gentle target of losing .5kg / 1lb per week for the immediate future, at least until I shift the first stone or so and feel energetic and mobile enough to start some gentle jogging. Maybe if things go well beyond that, when I'm nearing my target weight I'll start going back to the gym, but that's too far ahead to worry about.

A History of Weight (should you be interested):

I used to be a rugby player and martial artist. When I was 20 and in the shape of my life, I weighed 85kg, and people thought I looked gaunt - this was when I was doing 2-4 hours training a day, 4-6 days a week, and eating whatever the hell I wanted. When I wasn't training, my healthy weight seemed to be about 93-95kg as a young adult.

However, I went through a pretty cataclysmic depression, and in the space of about 18 months put on something like 25 or 30kg. I felt and looked completely bloated. It took a couple of years and some conscientious dieting to control it, and I managed to lose a couple of stone and keep my weight around 105-110kg for most of my twenties.

A career change 5 years ago, and a move to London, completely changed my lifestyle. My weight has been creeping up over the last few years, and while I have yet to confirm it with some scales, I suspect I am now the heaviest I have ever been.