You'd never admit to that leggy blonde who started hanging round your boyfriend that you're grateful to her, but you have good reason to be!
If she hadn't started sniffing around, showing off her size 8 figure, endless legs and DDs, you wouldn't have embarked on a fitness regime and faithfully gone swimming every day to look better than her, so who do you have to thank for your buff new bod?!
This also goes for workmates who are going for the same promotion as you. Their good qualities motivate you to fight and prove your worth.