I love to cycle.  A few years ago I was very heavy and it was through cycling that I was able to lose 115 lbs.  Riding here in Hawaii can be gruesome, because there are no flat roads - you're either climbing hills or flying down them.  I have been trying to ride hard often, and once a week I ride about 40 miles to the north part of the island, called Kawaihae.  On my ride there a couple days ago I took this shot while en route.  My computer reads that I'm going 30mph and it's 97 degrees.  What it doesn't show was that I was riding against the wind, surrounded by nothing but black lava fields! Talk about torture!! I love it. 
so...if you've never tried cycling, grab a bike and just start peddling - I'm sure you'll love the rush as much as I do.