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Maybe you guys have to be flexible with your pushups time. For example, it mustn't always or only be in the morning that you can do your pushups, and so when you missed doing it in the morning then that day is missed out. No. You could try to take it into the evening/night, doing it like about an hour to your bedtime. The weather will even be friendlier at that time of the day too. And another benefit of taking out the opportunity to workout at night is that you just go to bed and relax the body. Not having to do other activities like with the morning workouts.
I believe many of us are doing it morning and night so it doesn't have to be a stressful thing, when you push yourself too much you can't believe what you can do. For me is not even about doing it every morning is just that some persons don't like stress that's why they go for morning or night, anything that has to do with exercises some don't have that time to try it, that's why it becomes a thing to choose.
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Exercise can be a very difficult task to keep up with oneself consistently. And mostly what usually lead to people giving up is when they decide to give excuses to skip a day or two and before they know it, it has gone from days to weeks. Coming back becomes even harder because when you remember the pains your muscles gonna give you since it has relaxed due to how long you have skipped from working out.
And hypothetically from what I think, aside from BTC price reaching 100k, what also led to some persons tired out and quitted was that they didn't had a workouts partner which both could be encouraging each other either to take it on in the evening or morning as the case might be. But still, some would say that's not an excuse.