Kettlebell training
Kettlebell training, mainly swings, goblet squats and presses, does improve strength and jump height in short trials. It did not beat barbell lifting for maximal strength, and the research base is small and of low quality. It is a good, portable tool, not a superior method.
What the science says
- Swings improve maximal and explosive strength Moderate evidence
Lake and Lauder (2012) had 21 men do 12 rounds of 30-second swings with 30 seconds rest, twice a week for 6 weeks. Half-squat 1RM rose 9.8% and vertical jump 19.8%, not significantly different from jump-squat power training.
- Less maximal strength than barbell lifting Limited evidence
Otto et al. (2012) randomized 30 men to kettlebell training or weightlifting plus heavy back squats for 6 weeks. Both improved, but squat strength rose more with the barbell; jump height and body composition did not differ. One short trial, so treat it as a signal.
- Builds back strength, not aerobic fitness Limited evidence
In a workplace trial (Jay et al., 2011), 40 adults did ballistic kettlebell exercise 3 times a week for 8 weeks. Trunk extensor strength increased versus control, but aerobic fitness did not change.
- The overall evidence is thin Limited evidence
A 2019 scoping review (Meigh et al., 99 publications) found that most longitudinal studies were underpowered and of low methodological quality, with typically trivial to small effect sizes, and rated confidence in the reported effects low to very low.
How to apply it
Use kettlebells as resistance training with the same rules: enough load, progression and effort. Pair swings with squats, presses and rows.
Who should be careful
Learn the swing as a hip hinge, not a squat or a lift with the arms, ideally with a coach; a rounded lower back under fatigue is the main risk. Clear the space around you and use a grip you can hold. Anyone with back pain or a joint problem should check with a physician or physical therapist first.
Frequently asked questions
Are kettlebells better than barbells for strength?
No. In a 6-week trial, squat strength rose more with barbell lifting than with kettlebell training.
Do kettlebell swings work as cardio?
Not clearly. In an 8-week workplace trial, kettlebell training raised back strength but did not change aerobic fitness.
How strong is the evidence for kettlebells?
Weak overall. A 2019 scoping review found mostly small, low-quality studies with trivial to small effects.
Scientific references
- Kettlebell swing training improves maximal and explosive strength
- Effects of weightlifting vs. kettlebell training on vertical jump, strength, and body composition
- Kettlebell training for musculoskeletal and cardiovascular health: a randomized controlled trial
- Kettlebell training in clinical practice: a scoping review
More training methods
- Drop sets Moderate evidence
A drop set takes a set to failure, then immediately cuts the load and keeps going.
- Rest-pause sets (including myo-reps) Limited evidence
Rest-pause means taking a set close to failure, resting 15–30 seconds, then squeezing out a few more reps, repeated a few times.
- Supersets Moderate evidence
A superset pairs two exercises back to back with little or no rest.
- High-intensity interval training (HIIT) Strong evidence
HIIT alternates short hard efforts with recovery.
- Zone 2 training Limited evidence
Easy, steady cardio clearly improves fitness and health, but the popular claim that "Zone 2" is a special, optimal intensity for building mitochondria and burning fat is not supported.
- Fasted training (fasted cardio) Limited evidence
Training on an empty stomach burns more fat during the session, but that does not translate into more fat lost over weeks.