I am a cyclist but not a mountain biker so riding these trails definitely is not my thing. But what a workout he must be getting. Nice composition and you've captured the scene perfectly
I had a wonderful holiday in Arizona, loved the Saguaro, loved it all! We also did mountain biking near Phoenix, wonderful memories :) But hiking is easier - and we saw more as we could stop concentrating on the terrain in front of the wheels!
Hiking is much more my forte, slower and I can stop to get a shot or two. Like the perspective and do admire those who have the strength and will power to take on those hills with a bike.