weak or often sick - sickly, sth that can affect the heart and the way it works - heart defect, to participate - to be involved, the most important / the hardest thing to go through - ultimate challenge, relating to the mind - mentally, to leave - to drop out, to reach the point when you are so tired that you can't continue - to hit the wall, to use all / to use up - to run out of, pain in muscles - muscles cramp, organs that are used for breathing - lungs, to get / to receive - to obtain, to arrange in rows - to line up, to deal with - to handle, excited, extremely happy - thrilled, to be included (e.g. in a race) - to enter, to plan - to set out, vital, extremely important - essential, to use (food, fuel, energy, etc.) - to consume,


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