Write about a time you worked really hard for something the subject is exercise
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Alright.

Becoming a runner has its advantages. Besides offering an activity you can do anywhere with just a pair of sneakers (and perhaps a friend or two), it’s also a solid way to crush calories, maintain a healthy weight and get a dose of meditation. Better yet: A recent study, covered in The New York Times, found that running could hold the key to a longer life span — more so than any other form of exercise. (We’re talking an extra seven hours of life for every hour you run.)

Pounding the pavement can take some dedication — but it doesn’t have to take all of your time. And you don’t even need to be all that athletically inclined. For some motivation to get out on the open road, we talked to real runners across the country who found the sport a little later in life.

Whether you hope to run 10 minutes a day or 100 miles a week, let the reasons they started running — and never stopped — inspire you to find your stride. One lesson from their stories you’ll want to keep in mind: It only takes one small step to get started.

i really worked hard for my dance practice because i wanted to be best in the competition . i practice about 2 months without saying day and night . it was like my dream to be a best performer . when i was practicing dance i was feeling flexible and comfortable then i realized that dance was a very good exercise for my body and brain. finally my hard work helped me and i was declared as best performer . So i really think that hard work is the key to success .

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."

answers may vary, but my guess based on my personal education it has alwats been 3 or 4