I'm an idiot, a very sore idiot

So, I've decided to lose weight and part of my weight loss plan is to cut back on my driving and either walk or ride my bicycle to the places I tend to go to the most and save the car for long trips or bad weather. I've also subscribed to the 10,000 steps a day thing to help me lose weight, except for the fact that I totally missed the part where you work up to 10,000 steps. I walked almost 6 miles today, over 10,000 steps today, my thighs are so sore, I can't hardly walk. I'm going to fix something to eat, take an Aleve and pass out for the night.