3) Abductor/ Adductor Machine
This machine is all about training those muscles of the inner and outer upper thigh and getting that burn within them. However, since these muscles never work in isolation it is bad to work them out that way. Instead you should focus on lunges which work all of the muscles in the legs that typically work together. That way you are working out more muscles and they are working in a way they do naturally.
4) Lying Leg Curl
Not only do most people look ridiculous doing it, the Lying Leg Curl is really not an exercise anyone needs to be doing. It forces your muscles to work in a way that they do not normally move. Just about any other leg exercise will be more effective at working your leg muscles because they do so in a way that your legs are meant to and it works the muscles you actually use.