You can’t exercise like you used to
You may be trying to exercise. You may be finding creative ways to do so under these conditions. Perhaps you have a workout bike. Or you’ve ordered new workout equipment. But there is a good chance you aren’t exercising like you used to. Your instructor isn’t right there to pressure you to spin harder. You aren’t at the gym, where you feel motivated by others to keep going. So you don’t exhaust yourself like you once did.