It’s heart healthy! I’ve told my wife since I owned my Elise and now the Exige, that there is something going on physiologically speaking when I drive it. Palms sweat, heart races and I feel a little euphoric. Yesterday, I went for a spirited drive before my workout with my heart rate monitor on. I got on it up a long entrance ramp to the freeway, on second cam most of the way, up to about 100 mph. My heart rate was at 155-eek-! Proof! On the 30 minute drive my average heart rate was 128. So it’s not the tread mill, but it’s a hell of a lot more fun. I wish I had thought of wearing the heart rate monitor to the track. I’ll bet it would be scary high! BTW as a beta, I drove the Lexus to the gym today and never got the heart rate above 75.