Originally Posted by rsbob

In 15 years of running, only experienced the high twice but would only 4 to 6 miles at a time. Most of the time it felt like stoic necessary drudgery ‘to get in a workout”. For many of those years there was no such thing as headphones/earbuds either so I just listened to my breathing and feet.

Never felt euphoric on a bike but definitely have gotten into rhythms where my legs felt like pistons which were firing away with seemingly endless energy. My non-euphoric highs come from bombing down a hill on my road or mtn bike and downhill skiing (especially skiing). Mix speed, technique with a bit of risk, keeps my adrenal glands functioning. So no euphoria, just excitement. YMMV