stamina

Question
I recently played two rounds on two different days. The first nine on both were great. The back nine on both rounds, the wheels completely fell off of my game. I was wondering if you had any advice. Thank you.

Answer
hello brian and thank you for the question. when i was young and just started to play the game, the 18 holes were just so much for me.  but as time passed by, i realized that 18 holes were a piece of cake to me.  soon, i got up early in the morning and played 36 holes without breaking a sweat.  and i am still able to do so.  if you are a player who just played this game for 2 to 3 years, then let some time pass by and let your game used to 18 holes.  i wouldn't suggest playing 36 holes just for you to get used to 18 holes but i do suggest that you use a pull cart if necessary. they are a great way to get some excersice and still make it easier for you.  already use a golf cart?  then make sure to get something to eat or drink after every 3 holes.  i suggest drinking a little bit after few holes and always eating little crumbs and there to keep you going.  don't eat just after 9 holes.  eat every other 3 holes.  so bring enough to eat and drink.  its essnetial to do that.  already eat and drink enough?  then try strechingg before playing.  strech your legs especially and your knees and of coure, every part of your upper muschles.  its recommended to strech 30 minutes.  other alternative is to use a cart.  already using one?  then it means you need to work out to get your body used to 18 holes.  working out is not my specialty so you can ask an expert who commits to working out to suit your body to golf.  she is under sports section, bodybuilding and her name is Lynda Lippin, a well known golf pilate instructor.  you can ask her for some tips to improve your stamina overall.  good luck and i hope i was able to offer you some help.  
but i do recommend trying out my tips of eating, streching and etc.  they will greatly help you to imporve.  and if you have played this game for couple of months or one or two years, then i suggest waiting a little while for your body to get used to 18 holes.