Work a good honest day's hard physical labour.
Lactic acid builds up and that's why it starts to burn.
Lifting weights = subject builds muscles = predicate
Lactic acid
it builds muscles and it is good for everyone
Lactic Acid
Lactic acid is formed by anaerobic respiration, and builds up in the muscles.
exersize, builds muscles, etc.
Canary Islands
lactate
Builds strong bones and muscles.
protien builds your muscles and makes you feel full after eating.
The muscles do not have enough oxygen for aerobic respiration.