Kettlebell

A kettlebell is a cast-iron (or steel) weight shaped like a ball with a thick looped handle. Its defining feature is that the center of mass sits below and outside the handle, so the weight wants to swing and rotate around the grip. This makes it especially suited to ballistic, hip-driven movements — swings, cleans, snatches — that train explosive hip extension, posterior-chain power, and grip, and that elevate the heart rate enough to double as conditioning (often programmed in interval/HIIT style; see HIIT (High-Intensity Interval Training), Ballistic Training).

Kettlebells also handle "grind" strength work — goblet squats, presses, Turkish get-ups, carries, and rows — where the offset load increases stabilizer and core demand versus a dumbbell. A single moderate kettlebell can run a full workout, which is why it is a favorite minimal-equipment tool (see Minimal-Equipment Substitutions).

Sizing. Traditionally sized in kilograms; common starting points are roughly 8–16 kg (18–35 lb) for many beginners doing swings, scaling up from there. Competition kettlebells are a uniform size across weights; cast-iron kettlebells grow with the load.

Technique caution. The swing is a hip hinge, not a squat or a front raise — power comes from the hips, the arms guide the bell. Poor hinging or pulling with the lower back is the main injury risk (see Kettlebell Swing).

• Offset center of mass (below/outside the handle) → built for ballistic swinging.
• Best for swings, cleans, snatches; also goblet squats, presses, get-ups, carries.
• Combines strength, power, and conditioning in one implement.
• Common beginner swing weights ≈ 8–16 kg; competition bells are uniform size.
• Swing = hip hinge driven by the hips, not the arms or low back.