I have tried to exercise straight every single day. I usually get through a couple of weeks, then something happens (super busy day, special event, getting sick, etc), and I end up taking a day off.
I think that working out every day is a good goal, but it shouldn't be all or nothing. For example, when I miss a day after promising to work out all the time, I always feel a little sad and down on myself. Or, I tell myself that it is okay because I have done *so much* working out recently, then the one missed day turns to two, then three... etc.
For me, I have gotten the best results when I allow myself to take a day or two off when needed. I also find it helpful to be on a routine that allows for lighter exercise mixed with harder exercise. For example, I have a couple exercise videos with different levels, so on days when I am tired or have less time I will do a shorter, less intense 15 min workout instead of my usual 30-40 min one. This usually lets me keep up my streak without killing my muscles
