How to add agility to your road workout...

Take two whippets and harness them to you via a waist belt on 6' leashes then commence your workout.  One of said whippets should be a mature adult and the other a youngish puppy.  Once you begin to jog the puppy will race side to side and then stop suddenly to sniff or pick up a pine cone.  You must then leap over the two leashes that are now intertwined (be sure not to fall over the adult dog) all the while watching for the puppy to return to her side to side movements.  You then need to stop, un-wind the leashes, and make sure everything is cleared for take-off.  Re-commence your workout.  Repeat 25-30 times and you will really begin to feel the benefits of adding a dimension of cross training into your hum drum everyday roadwork.  The best part of this - other than the adrenaline rush for you - is that both whippets will be completely ready to sleep for the rest of the day and you can get many other things done.  It can work with other breeds as long as one is young and very happy to be outdoors...