how to gain muscle in your legs

If you want gain muscle in your legs you have to follow these rules.
1. Do legs workout either at home or in the gym. Here is a link to the nice set of exercises http://www.youtube.com/watch?v=IQQEHeZQKPA&feature=fvsr
2. Eat food containing a lot of protein. For example tuna contains 20% of protein.
3. Drink protein shakes.
4. Remember that if you want to gain two kg of muscles you have to eat more than 140 grams of protein a day.
5. Apply some exercises during your bike rides. Find a hill about 1km long and 7% steep and push hard gear like 53/17. It depends on your level. repeat it from 5 to 15 times.
6. Don't go to bed hungry but also don't eat an apple pie before you go to sleep. Drink a protein shake insteas.
7. Don't skip meals.