화이팅 and 파이팅 both are correct. Since there's no F sound in the Korean language, we use ㅍ or ㅎ for F sound. For example, we write the english word 'file' as 화일 or 파일. There's no difference between them. =)

아자 아자 화이팅. 아자 아자 means Go it! Come on! Go to it!

아자아자 파이팅!

we a say and write "파이팅" & "화이팅".. is same mean.. we writing "P" is "파이팅" and "F" is "화이팅" .. is Korean rules but.. no problem.. bcoz.. is same mean ..

What is the correct pronunciation for "aja aja"???