Kettlebell Swing Interval Timer

Kettlebell swing intervals are a foundational conditioning tool in the StrongFirst, RKC, and CrossFit communities. The 40/20 default (40 seconds work, 20 seconds rest) matches the Simple & Sinister warm-up format and produces 15 rounds in under 16 minutes. During the 40-second work window, perform 10-20 swings depending on your bell weight and training goal; the 20-second rest window lets you set the bell down, reset your hinge, and breathe. For pure conditioning, increase to 30/15 or even 30/10. For technique practice and heavier bells, use 40/40 or 60/60 to prioritize quality over metabolic demand. The 5-second warning beep signals you to finish your final swing and return to the start position cleanly.

Forty-second intervals with 20-second rest produce a 2:1 work-to-rest ratio that challenges the phosphocreatine and glycolytic energy systems while keeping per-interval volume manageable. Research on kettlebell training shows this ratio effectively improves both aerobic capacity and explosive hip hinge power when sustained across 10+ rounds.

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❓ Frequently Asked Questions

What interval ratio is best for kettlebell swings?

40/20 (2:1 work-to-rest) is standard for conditioning. 30/30 (1:1) is better for learning technique or using heavier bells. 60/60 (1:1 with longer intervals) is used in Simple & Sinister style training.

How many swings should I do per interval?

10 swings per 30-40 second interval is a common target. Adjust based on bell weight: lighter bells allow more reps; heavier bells require fewer reps to maintain power output.

Can I use this for one-arm swings?

Yes. One-arm swings use the same timing. Switch hands at the halfway point of each work interval or between rounds, depending on your protocol.

What kettlebell weight should I use?

Men typically train with 16-32 kg for swing intervals; women with 12-24 kg. Start lighter than you think necessary and focus on hip hinge mechanics before adding load.

Can I program this as an EMOM?

Yes. Set work time to 60 seconds and rest to 0 seconds for a pure EMOM format where you swing at the top of every minute.

Can I adjust the settings for a longer session?

Yes. Increase rounds to 20 or 30 for a longer conditioning block. Many StrongFirst programs use 10 sets of 10 swings, which fits a 40/20 x 10 rounds format.

Does this timer work for Turkish get-ups too?

Turkish get-ups use much longer intervals — try 60/60 or 90/30 for get-up practice, adjusting in the settings panel.

Will this timer work offline at my gym?

Yes. Once loaded, the timer works offline. Add it to your home screen as a PWA for gym use without internet.