*Resistance training is any exercise that causes the muscles to contract against an external resistance with the expectation of increases in strength, tone, mass, and/or endurance. The external resistance can be dumbbells, rubber exercise tubing, your own body weight, bricks, bottles of water, or any other object that causes the muscles to contract. http://www.emedicinehealth.com/strength_training/article_em.htm
Interestingly, I meeting quite a few people who are being prescribed anti-histamines by their docs to deal with asthma/wheezing, abnormally high heart rate and passing out while exercising. Wouldn’t it be simpler to go on a low histamine diet? Probably not, but it would yield better (healthier) results!