I mucked about on bikes as a kid. Bought my first racer at 15 in '85 and it was my freedom until I could start driving, I presume if got sold/scrapped at some point. My old man turned up with a purple Raliegh MTB in '91 (looking back, probably nicked and bought in a pub for £20) basically a race frame with knobbly tyres, which I did trails on and commuted a bit, by '92 I was living in Aylesford and my commute included a bit of my current Chatham commute (if I met my 22 year old self now I'd show them a clean set of heels in no time flat) I got married in '92 in the Autumn and came back to bad weather which stopped me commuting and I rode a lot less. In '94 I had a motorbike accident that left me with significant back problems and from that fitness issues. In 2011 I threw the purple Raliegh away during a clear out (I still regret that) within 6 months I'd bought a second hand hard tail Mongoose and my first ride out on that would have been with my teenager, driving with the bikes across the Medway valley to avoid the hills and trying to do 7 miles or so of flat, muddy trails and failing hideously I was so unfit (and around 23 stone at this point) then working out every ride from our house goes uphill at some point, we live midway up the valley, and almost dying trying to do a less than 4 mile loop on the road. We were talking a few days ago and my now almost 20 year old said back then I was a sweating mass of flab saying "I'm done for, go on without me, bury me where I fall" whereas now they couldn't keep up with me if they wanted to :-)
So, a 3.7 mile loop with, looking back on it, maybe 200ft of elevation.