Cardiovascular so you can pump oxygenated blood through the heart
Give you lack of nutrition and will take a toll on your ability to function through out the day. feeding your brain is like getting rest so you are recharged with out it you get tired sluggish and grumpy easily.
i'm unsure of your statement, but i believe that the statement is false. A rake would add more physical activity, since you're using both leg muscles while walking, and arm muscles.
D jams,ska,a,kalakskwkwkwkw