Best home gym equipment for runners: the Kettler Sport Arena Treadmill is a HIIT and cardio essential. The Kettler Sport Arena Treadmill is ideal for recovery, HIIT workouts and anything in-between.

There's a faster and simpler way to get your cardio done, a study concludes. By Ron Kaspriske. March 21, 2025 ... Most of the action in our sport takes less than two seconds.