What can help with increasing size in the penis? and stamina?

Weight loss: The answer to both your queries is weight loss; men with abdominal girth who lose weight can gain 1 inch in overall length; as well as increase their stamina levels. Aerobic exercise(e.g. Walking/swimming) can do the same{shrinkage from the pool aside :) }.

Healthy living: Nothing will change the length of the penis. Losing weight will make the penis appear larger as it will not be concealed in the pubic fat pad. As for stamina, a healthy lifestyle including a balanced diet, aerobic exercise, and adequate sleep are the best and safest things you can do to help youself.

Surgery/weight loss: There are only a couple of strategies that may appear or actually enhance penis: 1) losing weight if you have a thick pubic fat pad. 2) surgeries: the penis is connected to your pelvis with a tough fiber called the suspensory ligament. This holds back some of the penis shaft and hides it inside your body. Surgically cutting the ligament releases tension and ― theoretically ― more of the shaft.