I wish. My heart rate is high because I am not yet in good shape. 55km around a mostly level course with no traffic or intersections isn't too challenging. Luckily fitness comes pretty fast if you ride regularly. My first good ride of the season was only 3 weeks ago, and my legs felt like spaghetti afterward. But I notice an improvement with every ride, today's ride was longer and faster, but felt easier than my last ride.