Summer Heat, Out of Shape

The dog days of summer are definitely here in northern Florida, with the temperatures daily climbing into the low 90's.  Right now the temperature, according to my weather station on TV, is 91 degrees although just below that figure is shown the predicted high for today: 86!  We're getting some relief from time to time, though, with some thunderstorms bringing some welcome coolness.  The humidity is low at 44 %, so despite the heat I went outside running.  My main problem with running isn't the summer heat, or even the right foot pains that I've previously discussed here.  No, dang it, I am out of shape, having put on a few pounds and then having to carry those extra pounds each time I take a step.  Time for me to shape up...