Former shot put world champion Christina Schwanitz is set to retire at the end of the year. “This year will be my last, my sporting goodbye. I hope it will be a good one,” the 36-year-old German told the Freien Presse newspaper on Thursday. The world championships in Eugene, Oregon in July give her a chance to sign off on a high. She took gold at the 2015 edition in Beijing. She had planned to quit after last year’s Olympics in Tokyo but an early exit in qualifying made her think again.