Add Yahoo as a preferred source to see more of our stories on Google. Joel Sorrell/Getty Images Lunges are a simple exercise to strengthen the lower body and core, with or without weights. Proper form ...

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Rita Ora crushes fitness the same way she crushes singing, songwriting, and the red carpet. Which is to say, flawlessly. For evidence, see an Instagram video posted yesterday by celebrity trainer Ben ...

In general, lunges are pretty polarizing — and if a set or two always leaves you with achy knees, we know exactly where you stand. While lunges can quickly amp up your at-home workout, the lower-body ...