[Sweet Apple]

I walk Apple every morning and evening for about 30 minutes...She doesn't pull ahead and try to run, but she wants to take 10 steps, then sniff sniff, pick up every leaf, twig, pebble and I give a short tug, and we walk a little further, and it goes on and on...I want the walk to be about constant exercise for her (cardio, etc.)...I'm o.k., because I do the treadmill each morning...Is there anything I can do to encourage her to just get w/the program? If she sees a bird, person or another dog, she's more than willing to get going, other than that she just wants to lolly-gag...I don't want her walk to be an unpleasant experience, so I don't make a big deal out of it, but I do tire of the walk, sniff, tug, and repeat, twice each day