She doesn't know.

Jenna was in her third semester of community college and was beginning to fill the holes left in her graduation requirements as a certified personal trainer. She was a forgetful girl and didn't have the best attendance record as a result the unknowly naked girl was currently jogging her way to an extra credit P.E. class her hippie of a professor put on in a public park downtown every Saturday morning.

The athletic 5'7" brunette continued along on her several block jog to the bus station. By the time she was rounding the corner out of her cove Jenna was more awake and aware of her surroundings, but still very much in her own music induced world. She made it a little less than two blocks before she was seen for the first time. A father and son pair moving boxes into their new home. Both agreed not to tell the mother and that moving to San Francisco was a good decision.

As she turned the corner at the end of that block the number soon climbed into the dozens as Jenna ran for a quarter mile on the side of a two lane each direction proper road.
Her legs pounding away to the beat thumping into her earbuds the naked coed half danced half jogged down the road at a steady pace. Going naked was technically legal here. Which explains why the mail carrier didn't do anything but stare as Jenna ran past.

She ducked into another sub-division knowing a shortcut to the busy main thoroughfare and bus-stop. After she ran another three largely uneventful blocks, Jenna came to the shortcut. Not exactly a secret but something you'd have to be from the neighborhood to really make use of or have cause to know about at the end of one of the coves here there was a highway style guardrail on one section blocking cars from driving up a narrow concrete arch/pathway crossing over a total of 12 lanes of highway traffic.

She paused at the top of thee arch to catch her breath and enjoy the view from nearly 30 feet up. She watched through a chain link fence as the traffic going away from downtown flowed normally at a fairly steady pace. one or two cars at a time every couple seconds. The otherside was a different story, Saturday morning lighter traffic or not the commuters in general still had places to be and did not appreciate the road work gumming up proceedings. The stop and go traffic going from 3 lanes to 2 just past Jenna's perched position on the archway and backing up for miles became suddenly more amiable as the number of people to have noticed Jenna's nudity before her climbed well into the hundreds.
The Oblivious teen herself was both catching her breath and going through a mini version of her stretching routine to keep her muscles limber. As open as this position was it was the most detached from leering eyes she felt other than on her own property.

It was just something attractive women learned to deal with when they worked out in public, men and sometimes other women would stare and judge. Jenna had gotten very good at tuning them out but the world seemed extra fixated on her body today.
She told herself she was just nervous about working out in a public park. She took a deep breath and exhaled slowly as she used the handrail as a balance beam and sank down into an almost complete splits. God the sun felt great today, her feet felt light, just everything felt so free.
Jenna made it out the other side of the overpass-walkway without causing anyone to have a heart attack or car accident. And proceed down the much more urban block on the other side.
Passing an apartment building she considered taking a long block when she saw who was in the parking lot cleaning their car...