Adverbs frequently end in-ly; however, many words and phrases not ending in-ly serve an adverbial function and an-ly ending is not a guarantee that a word is an adverb.
Lance Armstrong's strength and endurance sometimes seem too extraordinary to be believed. Armstrong, a six-time winner of the Tour de France bicycle race who next month will try for his seventh straight victory, can cover 32 miles, or 50 kilometers, in one hour of riding. In contrast, the average cyclist covers 16 miles; a top marathon runner can cover 21 miles on a bike. Armstrong can ride up the mountains in France generating about 500 watts of power for 20 minutes, something a typical 25-year-old could do for only 30 seconds.
I am now a lot fitter, have a road bike and cycle a lot further without feeling shattered at the end of it. I now average 15mph on a short ride (up to 15-20 miles) and between 12-14mph for longer rides (over 35 miles). I reckon I do 10 miles in about 40 mins. I can do 15 in an hour or just under.