Add Yahoo as a preferred source to see more of our stories on Google. Credit: Getty Images Workout challenges can be dumb, especially ones that involve your abs. Yet, we can't get enough of them, ...

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Stretching exercises like the hamstring and quadriceps stretches help prevent tight muscles and improve flexibility. Strengthening exercises such as quadriceps sets are important for correcting muscle ...

The hamstrings tend to get a lot of love during a stretch routine (who doesn’t have tight hammies?). When it comes to strength training, though, the quads and calves steal most of the spotlight — ...