“If you were to stick me in a prison where all I had was a 16kg or 20kg kettlebell, and you told me I would only be let out when I was in the best shape of my life, I could pull it off ...

John’s advice was to aim for “quality completion” – cruising through the movements smoothly, and only resting briefly during the transition between the goblet squats and press-ups. To reap the full ...