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  • BRISTOL & MARK photo | Bristol Palin, Mark Ballas

Credit: Craig Sjodin/ABC

Updated: Thursday Aug 23, 2012 | 03:00 PM EDT

BRISTOL & MARK

With a new fitness regimen, Bristol Palin – who teams up with her previous partner, Mark Ballas – vows to get in shape for her second stint on the show. "My goal [is] not to gain any weight," the young mom tells PEOPLE. "I think it's hurtful for any girl when someone's criticizing their weight on a national level. It's an awkward position."



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