For those saying "I don't get why people thought it was an hour once a day" - that's what people were led to believe. Once a day for exercise, then Gove made his remark which was taken as gospel. If the law was different this was unclear.
Then, lest we forget, there was a lot of social pressure NOT to exercise from some quarters - FB, Twitter, Mumsnet, etc. It wasn't "life or death" was it? The police sending up those drones in Derbyshire shaming people out walking. The photos in the tabloids of busy London parks, with the subtext that people shouldn't be doing it, "what lockdown, eh?" All the shocked and horrified comments on such pieces. Where the hell else were people in London supposed to walk? It was legal yet they were publicly shamed. Photos taken to make it look like they were all closer than they were.
Local FB pages were a nightmare. People posting about looking out of their window and seeing 'all these people walking past'. Some with photos of families out walking. People saying "where were they all before, I never saw anyone exercising, it's not necessary, they're just finding any old excuse to go out! STAY AT HOME!" and someone saying that "when this is over, we'll round up all those 'essential exercisers' and drag them off their fat arses and make them do laps" or words to that effect. Someone said people shouldn't put rainbows in their windows as 'people shouldn't be out to see them anyway' and it was encouraging people to go out. Friends - hitherto lovely, tolerant, understanding, sensible, non-judgy - all 'liking' a post that basically said "if you step over your front door and it's not life-or-death, then you are making a choice to put everyone in your community at risk". Others saying 'just exercise at home, do Joe Wicks or star jumps, who actually needs to go outside?'. Neighbours with kids didn't leave the house at all for months and said things like "I don't get these so-called parents desperate to put their kids at risk". The sudden and disturbing psychological manipulation, that people all leaped in with unthinkingly, that made people feel they SHOULDN'T go outside, even if there was no danger in what they were actually doing, even if it was allowed - this absolutely DID happen and the way it did, the speed it did and the number of ordinary people sucked into it was horrifying. I don't even know how it started. It's great if you were thick-skinned enough to resist it, to do what was best for you at the time but a lot of people weren't. After being initially told by friends/family on SM that going out of the house, unless you really had to, made you 'one of the bad guys' or 'part of the problem', how easy is it really to switch away from that? Who was really going to go on a six-mile walk after hearing all that, knowing that if they were seen they risked hatred and social censure? It was tough. Luckily it abated, people saw that their peers had been out walking/bike riding etc and felt emboldened to do the same... but in the early days it was horrible. We can forget that, but it did happen. Not everyone, but enough people to make a difference. Those who felt differently often kept their heads down.
People forget all this happened. They insist that they, their family, friends, were never OTT, never judgy, never irrational, hysterical. No one ever criticised others for going out to exercise or said you couldn't sit on a bench. No one ever said 'just because you can doesn't mean you should'. Everyone was sensible and practical and no one liked or posted shaming, judging stuff on social media making others feel like they couldn't or shouldn't do stuff. Yes they did. It did happen. Granted, some were affected by it more than others but it was mind-blowing and disturbing. I never, ever want to go back to those days but it shows how easily it can happen.
Also, there were tales of adults shrieking at kids who got too close on walks. I didn't want my kids to accidentally breach some imaginary exclusion zone and get roared at. And so that meant holding kids' hands at all times, even in places where it was safer for them to run a little bit. And walking at their pace. Which brings me on to people with kids too little to walk that far but too big for carriers/prams. They were limited in how far they could go.
Then you were told not to travel for exercise (see police and the drones, showing the shameful cars in the car park of people who had travelled to go on a walk). Remember - if you had a crash it would be so selfish, walk from your house etc etc. Not everyone has countryside that lends itself to extensive walks and bike rides. How much suburban pavement trudging can you realistically do, even if you have the time etc? Plus, some places did have different rules such as exercising-from-your-front-door, county boundaries etc. Not everywhere is England-mostly-in-Tier-2 which often gets forgotten on these threads.
Many parents did relay shifts working and looking after kids. Looking after kids 6-3 then working til midnight doesn't leave much time for 10K runs. Often kids were young and in need of attention or help with homeschooling. Primary school kids often needed the parent to engage with all the homeschooling or it didn't get done.
Others, with and without young kids, were working long hours due to increased pressures, not just NHS but others too. Some were shielding and told not to leave the house. A relative got a shielding letter and it pretty much said this.
That's all without the whole drinking-more-due-to-stress, comfort-eating, the fact that food and drink were some of the few 'treats' allowed in a miserable time.
I suspect the OP knows all this and just wanted to wind people up.