As the Sarasota Herald-Tribune reports, the lump in Ron Kraemer’s chest turned out to be something rare and serious: soft-tissue sarcoma. But as a fitness instructor, he proved to be a more than formidable opponent, refusing to give up even when the surgeon had to remove 80 percent of his upper chest muscle, when his arm and hand doubled in size from lymphedema, when 35 sessions of radiation inflicted painful burns and even when his insurer refused to pay the bills.