Remember this photo?  It was taken on my Annapurna Circuit trekking trip.  

After we settled down at a guesthouse, we took a day hike to a very high location, probably around 5000 metres.  

I raised the idea of taking jumping photos.  Both myself and Aaron, another young Canadian guy, did it.  

But it's not easy to catch a good jumping photo!  So both of us jumped a lot.  Eventually we got satisfying photos.  As the one you see here.

But there was a consequence!  That night Aaron became sick.  He got a bad headache, a typical symptom of AMS.  

The reason is that, although both of us jumped a lot, Aaron is 8 years younger than me.  So he's more vulnerable to AMS.  I was fine though.