I have recently been experiencing a vibration feeling in my right upper leg. It feels like my cell phone is vibrating in my pants pocket - but it isn't. I have begun to increase my exercise, and have been walking vigorously 5-6 days/week for the past month. In addition, I began to wear a weighted vest, which I use about 4 times/week - I am carrying an extra 20 lbs. with the vest. I am not sure if it's muscle "spasms", circulatory or something odd with my cell phone (which I started only recently to carry in my front right pocket). I notice it more when I am at work standing for a while, which happens to be the same time when I carry my phone in my pocket (on vibrate). Thank you.