No you don't, but you don't get up to 25 stone in the first place by having a sensibly active lifestyle either.
If you want to lose weight, or avoid gaining weight, it has to be done by a combination of activity and consumption restraint. A mixture of walking and moderate intensity cycling is a good one but expect it to take a couple of years to get down to a normal weight from that starting point.
Nobody wants to be 25 stone but it takes a fair deal of effort to get that big.
You have to consume excess calories in vast amounts to be double the average human weight.
To undo this, you will never do it by going for a bike ride twice week or by following Joe Wicks on TikTok.
It's complete lifestyle overhaul that is needed.
I got up to 17 stone 5 years ago and I hated myself because of it. I tried crashing off weight and could lose a stone in a week by eating nothing but lettuce, but I would put it straight back on again after a few days.
The biggest change I made was giving up sugar in all of its forms. It was hard for the first month or so. The headache was really bad.
But as I got used to not having sugar in my tea and on my cereal, I noticed that I didn't feel so hungry for the rest of the day.
No Mars bar cravings at 3 o'clock, no bowl of ice cream just before bed.
My sense of taste began to lean towards the savoury and things that I found bitter before began to taste really good.
Mushrooms, Avocados, Spinach, Kale.
I started to cook more, play around with ingredients and slowly but surely the weight started to drop (I'm talking about a pound a month maybe).
But a pound a month is two stone in two and a half years and four stone in five years.
And here I am today, five years later, a 13 stone skinny arse cyclist.