Heart rate: It takes several minutes for it to increase to its required working rate. Also, heart rate goes up and down all day long, so elevating it for a little while is no problem. The heart is meant to beat from before we’re born until after we die (sometimes).
Joint lubrication: The joints are already lubricated, otherwise, when we moved from a standstill, our knees would grind (or whatever joint is used). Also, the only way to lubricate joints more is to squeeze the synovial capsules in them. This is accomplished by loading the joint. No amount of unloaded, non-descript activity will do it. The same applies to the muscles and their sheathes.
Body temperature: The body (meaning the muscles) are already at least body temperature. If you get much warmer, you start to sweat. This is your body’s cooling system. If you cool down, you shiver, which is muscle contractions generating heat to warm you. Your body wants to operate within a very narrow temperature range. Even if you raised your temp. 10%, you could die from heat stroke if it were maintained.
Blood flow: Blood flow increases with exercise, but there is already blood flowing through the muscles. Otherwise, they would turn gangrenous and have to be amputated.
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