The only method I found so far is to not urinate for a while. Therefore, while you do your cardio/weightlift exercises, you'll want to pee really badly..this will make your flaccid bigger and heavier, so it wont turtle so much.
Also...go to the bathroom, take a paper towel and put hot water on it. Wrap it around your turtled penis for a few seconds, this will help.
Do you guys know of any other methods? Turtling is bad for you and you should avoid it all the time.