Insects can interfere with exercise.
It's the exoskeleton shed by a cicada turning from a nymph into an adult. Can you see the covering where the eyes were? How about the large front legs used for digging?
The bulbous area in front of the eyes is the covering for the part of the mouth that pumps fluids from plants. The flap-like structure on the side of the body is the wing bud that develops into the wing of the adult.
Have you ever found a cicada nymph exoskeleton? Where did you find it? Did you look at it closely?