Biketism of fire

I took my bike offroad this morning. Short track - a good thing, given both my lack of fitness, and my complete MTB n00bness. 

However...

Short the track may have been, but it's not smooth. Lots of rocks, lots of sand, and a few hills, some steep (seemed like 45 degrees to me... thankfully short) - and replete with said rocks and sand. 

Max HR ... 220 - age = 180.

I reached 194 O_O

I didn't come off or crash, even down the hills with all the rocks, and the (hardtail) bike's rear slipping around appreciably. So I'm pleased with myself, and with my bike. 8)

I paused at the end of the track long enough to take this. It looks rather over-busy on my iPhone, but should be better larger.