For the Home Gym: Bowflex SelectTech 840 Kettlebell The Bowflex SelectTech 840 Kettlebell ($120, originally $180) is a space-saving kettlebell that combines around six kettlebells into one. It lets you change the resistance from eight pounds up to 40 pounds. Image Source: target.com Bowflex SelectTech 840 Kettlebell $120 from target.com Buy Now