Wearing cycling shorts whilst running - why?

Like this? VERY NSFW:eek::smiley:

http:/ /www.cumm.co.uk/images/cyclist%20bulge%20lycra.jpg
http:/ /www.lycrakeen.com/wp-content/uploads/2009/12/bulge014nx7.jpg

Bike shorts are padded. That’s what distinguishes them from plain old lycra shorts.