Can i ask you a bit of question about English Grammar?

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Jan 16, 2012 14:33
Ever since a free gym was established in my neighborhood in 2007, the number of people who exercised went up.

I can understand this sentence.
but I want to know. 'who exercised' can I use 'who excercising' ???

and

Even after the world cup, people had a positive image of Korea, after having seen the country's team spirit.

I hope to understand 'after having seen' ㅜ.ㅜ