You owe it to yourself to learn the facts...

Stretching, yes it does feel good and yes it may make you feel as though you are "exerting" yourself, however "stretching" does not relieve you of your responsibility to your body to engage in solid upright cardiovascular and anaerobic exercise. It is but a small part of the whole picture. By all means, if you have extra time, engage in any activity you like for as long as you like provided it causes you no harm. Do keep in mind, however, that engaging in proper and consistent upright (while standing) cardiovascular and anaerobic exercise also feel very good when you free your mind of all the "hype" surrounding the latest crazes and fads. Take the time to learn how to engage in proper and effective cardiovascular and anaerobic exercise safely. As always, consult your trusted physician before engaging in any physical activity and continue to arm yourself with evidence-based facts regarding optimum health and fitness found here. 

Climb, lift and eat well...