For the tightness in your legs, use a foam roller to smooth out the muscles. Check out the exercise below. I linked the picture to the website where you can learn more about how to properly use a foam roller. Click!
Now, for arms. Losing fat in the arms is the same as losing fat anywhere else in your body. You need to melt fat all over. This means more cardio, more cardio, more cardio, and watching your diet. Looks like you have a great running schedule, but seems like you’re plateauing. Change it up with intervals. Do some plyometrics. Shock the body with something new!