A University of Sydney study showed that people who participated in a 35-minute exercise routine after consuming marijuana had levels of THC 15% higher than those who smoked and did not exercise. The body stores THC in fat, and when exercising the body begins to metabolize fat. The reason for the higher THC levels in the exercising group is that as the body burns the fat, small amounts of THC are released back into the bloodstream. Thus increasing the active THC in your body and giving you an increased high.
The endocannabinoid system is the receptor for interaction with cannabinoids in the body. This system creates a naturally occurring cannabinoid in the body that affects physiological functions like appetite, pain and memory. When exercising the endocannabinoid system will release cannabinoids to help your body cope with the stress of physical activity. Consuming marijuana before exercising can be like giving yourself a double dose of these protective qualities.