Endurance rides feel absolutely useless

[rswagler1]

Polarized Zone 2 question

There are no specific adaptations that result only from exercising for a long time at a lower intensity. Such rides are “necessary” only in the sense that you have to train many hours per week to achieve “saturation”.* *And to condition ancillary muscles such as those in the neck if your event will have you on the bike for a long time.