Fencing is a lot of fun, its a great workout too. I also practiced French Style. I am not surprised your legs are sore, its a great a workout. Lunging is very important also extending the arm in foil to show the right of way. One exercise I did was stand in a narrow area or limit my area to make it narrow in order to work on balance and on your stances while practicing foil, I am assuming you are starting off with foil. I am glad its working out for you.