Essentially a weighted ball with a handle at the top, the kettlebell has been a mainstay in gyms across the world since the early 20th century, when Russian fitness pioneer Pavel Tsatsouline ...
This highly-rated treadmill from Urevo has a versatile two-in-one design: With the frame up, you can run up to 7.6 mph, and with the frame down, you can tuck it under your desk to walk up to 3.8 mph.