You can exercise every day. There are people who work 5 days a week at a physically active job, get in a bit of exercise after work, and then cycle or do some other sports on the weekend. Rowan is one of those people.
I don't have the physically active job, but since mid-Feb, I have had 3 days where I haven't exercised.
The key is to mix it up ... don't do the same thing every day. So one day, I might only walk for 30 min ... and another day I might cycle for 100 km or more.
But it is good to be active every day. "They" say that 30 min/day is a minimum ... and more is better. "They" also say that we should be getting up and doing something active once an hour.
That said, it is also good to pay attention to what your body is telling you. For example, an elevated resting heart rate over a number of days in a row might be a sign to ease back a bit. Aches and pains that just don't go away might be another sign.