Running with a singer

Joanna, one of "my" sopranos for Friday's concert, wanted to come for a run with me, so we did the Morton Hall route. She's a fair bit taller than me (and has a beautiful figure, and a stunning face...) and therefore much longer legs. The pace was therefore faster than I'd usually do on my own, with the result that the HR was about 170 bpm by the time we got back! (Of course, it could just be that she's fitter than me...)