"If we're talking game-changing home workout products, the Bowflex SelectTech 840 Kettlebell ($179) is the place to start. Bowflex sent me this adjustable kettlebell to try out, and it has gotten me through these long gym-less months, especially after dumbbells basically went extinct. It adjusts from eight to 40 pounds, and I've been using it for deadlifts, glute bridges, bicep curls and Russian twists. Living in a tiny apartment, the small size is a plus too." — Maggie Ryan, assistant editor, Fitness