I'm so excited! I got new tennis shoes. Have you replaced your tennis shoes lately? If your shoes have 500 miles or more on them, you should consider buying a new pair. Not sure if your shoes have that many miles, look at the tread pattern on the sole of your shoe. Is it less distinct? This is also a sign that your shoes need to be replaced to avoid slipping and/or possibly injurying yourself. My old shoes had more than 500 miles on them and the tread pattern was gone (well, not completely).