Kettlebells are one of the best training tools for longevity—here’s what to look for if you’re buying them, according to Peloton’s top kettlebell trainer

Woman in a deep squat holding a yellow kettlebell at her chest, on a blue exercise mat in a living room setting. .

Joslyn Thompson Rule has been a personal trainer for more than 15 years, so she’s used her fair share of weights in that time.

While she believes dumbbells and barbells have their place in any exercise routine, she says kettlebells bring something unique to the table.