I generally stretch briefly after exercise, and also occasionally do a hybrid Pilates/yoga session for core strength and limberness.
http://well.blogs.nytimes.com/2013/04/26/ask-well-do-we-need-to-stretch/?partner=rss&emc=rss
http://well.blogs.nytimes.com/2013/04/26/ask-well-do-we-need-to-stretch/?partner=rss&emc=rss
