Winter is here, and with it so is less daylight, colder weather and a load of challenges that keep people from feeling their ...

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Regular exercise supports immune health by improving the circulation of your immune cells and reducing inflammation, but overtraining may weaken defenses.

Our reporters have teamed up with fitness experts to design dozens of routines. Try something new — and build an exercise habit that sticks.

“Repeating the same movements every session can lead to boredom and plateaus,” Mosca says. “Mixing in playful elements—like ...