Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. January 21, 2026 Add ...

If you want to do strength training, but don't know where to begin, resistance bands are an excellent place to start.

Learn the benefits and risks of options and how to start trading options Lucas Downey is the co-founder of MoneyFlows, and an Investopedia Academy instructor. Samantha (Sam) Silberstein, CFP®, CSLP®, ...

Abstract: Spatial vectors are six-dimensional (6-D) vectors that describe the motions of rigid bodies and the forces acting upon them. In Part 1, we saw how spatial vectors can simplify the process of ...

Skiing is a tough activity to get into. It’s expensive, often involves travel, and requires a lot of gear. And that’s all before you’re even on the slopes actually learning how to ski. If you didn’t ...