Take on this intense ab challenge to strengthen and tone your core before the new year! Complete 200 mountain climbers, 100 sit-ups, 100 Russian twists, and 100 side-to-sides in this full-core workout ...

A 37-year-old personal trainer was the youngest in a group of people that climbed Mount Kilimanjaro. She completed the trek with clients in their 60s and said strength training is key to aging well.

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