You can also push ontop of/jounce each corner of the car to determine if the strut is bad or not. You can see the jounce/rebound easier.
Go to driver side or passenger side front, push down HARD on the fender/hood 2 or 3 times to get it jouncing and then let go and see how many times it jounces/rebounds. As stated - more than twice it's bad,=. - only once, it's good.
I would suspect the front first being that the struts carry a lot more weight than the rears.