Haven't had much chance to mountain bike lately with all the Ironman training, so figured I'd make the time.
Took both bikes (mountain bike + road) up to the forest, rode 2 hours in the trails with my buddy, then hit the road for 3 more hours to make up a full long ride.
Switching bikes was as jarring as the bike-to-run transition in a triathlon!
The road bike felt like a toy compared to the mountain bike with those little skinny tires and skinny light frame! I don't usually get that side-by-side comparison. The style of riding is entirely different as well. The mountain bike efforts are very bursty and lactic acidy, while the road style is so much more of a steady grind.
No idea if this kind of mixed training has any additional benefit, other than being a hoot!