MickEMT, has hidden not one, but two "Sweatin micros" outside of health clubs. However, this is not a nano on an electrical box in a target rich environment, whatever the heck that is supposed to mean. It is located in what I consider an interesting location along the urban archeological ruins of the former Colvin Boulevard, abandoned 50 years ago when the I-290 interchange was constructed. You can check this out on the Google Sat view, and see where it would have connected to the other original Colvin Boulevard, now a dead end, where the Army Reserve Center and apartment buildings are located on the other side of the highway.There is a road and a sidewalk here, check it out.
There is a Munzee, cleverly named "Sweatin' Munzee for Women" on the very similar wooden sign a couple hundred feet away, and hidden in identical fashion.
There is also a Geocaching.com listed LPC Micro nearby in the BAC for Women parking lot. It should have died an absentee cache owner and missing cache death way back in 2008, but someone had to drop a "throw-down" cache and claim a find, so that one still lives on in all it's glory some 4 years later.