Good excuses to quit track?

I need really good excuses or reasons to why I am quitting track..

Thanks
Update: IM THE TEAM'S LEADING SPRINTER...
so saying that i dont love the sport or im not cut out for it doesnt help at all..
Update 2: the real reason is because i have heart palpitations and my coach told me to stop running when the season started but i didnt but not it got worst and i have to quit but if i tell him the real reason, then he wont let me run next year
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