The last on (the liver excretes excess cholesterol in bile)
So im guessing your asking that we need to consider those 3 things when exercising right? well if hat is what you are asking then this is my answer but i dont care if you use it well we need to consider traffic when we are exercising because if we are running one way and we don't look both ways then we will probably get hit by a car we need to consider pollution when exercising because if we breathe in toxic chemicals theres a chance we could die and lightning because we could get struck by it if we are not careful .... wait you said lighting well lighting is important when we exercise because we could think we see no cars and then a car comes out of no where and bam splat you aredead
there you go hope this helps:)
