1 A highly toxic form (methylmercury) builds up in fish, shellfish and animals that eat fish. 2  Fish and shellfish are the main sources of methylmercury exposure to humans.3  Mercury exposure at high levels can harm the brain, heart, kidneys, lungs, and immune system. A highly toxic form (methylmercury) builds up in fish, shellfish and animals that eat fish. 2  Fish and shellfish are the main sources of methylmercury exposure to humans.
The 2016 Boston Marathon will begin on Monday, April 18. Here is some of the basic information you should know about the historic event. Length: According to Olympic standards, marathons are 26 miles and 385 yards, or roughly 26.2 miles long. Route: The Boston Marathon starts on Main Street in Hopkinton, Mass.
frequency most coaches suggest three to six long runs of 16 miles or more in the three months leading up to the marathon pace run at a comfortable conversational pace this may be marathon goal pace for slower runners or 30 to 90 seconds slower per mile than goal pace for sub 3 hour marathonersver 16 weeks my plan is for only 4 days of running based on tempo speed long and easy one swim session and one circuit session with one complete day of rest long runs go like this 18 20 10 mile race 18 16 1 2m race 21 10 mile race 22 18 20 15 23 15 10 marathon