It makes you want to exercise!?!
i spent well over 15 years doing a pretty fantastic impression of Cheech n' Chong, and i can honestly say that all it ever motivated me and my many friends to do was drink tea, eat junk food, play video games and watch movies. The idea of being stoned when working out is crazy- it affects your coordination, makes you lethargic and actually acts as a pychological depressant when used systematicaly (if you are used to being 'high' then your unaltered state comes to be interpreted as 'low', thus it can be psychologicaly addictive)
The physical facts are that smoking it damages your lungs. The pro dope movement would have you believe it is less carcinogenic than cigarettes, but its not true (ask Bob Marley- oh no, you cant, he died of cancer
). Dope is inhaled and held in a different way to cigarette smoke, and so has been shown to damage the windpipe and entry area to the lungs more than the area that cigarettes are known to attack.
As well as the lung damage (great for CV fitness) and the depressive lethargy (always sure to make you sparkle in the gym), you have the dreaded 'munchies'. I have a good appetite, but the amount of food that you can eat when the 'munch' hits you is obscene. I would regularly think nothing of demolishing an 18" house special pizza (delivered of course) in one sitting, and find room for ice cream after a break! binging on convenience food does no favours for your physiology or your waistline.
whatever stance you take on marijuana, be it pro or con, and for whatever reasons, social or political, neither side of the argument could put forward a convincing argument for Weed as a performance enhancer.
There was a guy in the snowboarding event of the winter olympics who tested positive for marijuana and had his medal stripped from him. I always thought he should have been given extra credit for being able to do that stuff stoned!
It is true that there has been considerable 'breeding' of different marijuana strains over the years, and that there are differing strengths dependant on the amount of HTH (the active element of the plant). The effects are also more unpredictable in marijuana resin ('solid' or 'soap bar'), because those that make it (organised criminals) dont care about your wellbeing, and put anything from engine oil to excrement in the mix during its creation. ingesting the other ingredients in ignorance along with the marijuana can do anything from make it seem weak, to leave you crawling around the floor with a splitting headache working out which bit of carpet you are going to vomit on.
I would never advocate its use, but if it is your choice to use marijuana, I would recommend avoiding resin on the grounds of not knowing what you are really taking, making it far more dangerous.