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Continue to ChatJohn McCallum, 'Training for Gaining', The Keys to Progress https://physicalculturestudy.com/2021/11/15/john-mccallum-training-for-gaining-the-keys-to-progress-3/
John McCallum, 'Training for Gaining', The Keys to Progress https://physicalculturestudy.com/2021/11/15/john-mccallum-training-for-gaining-the-keys-to-progress-3/