Resources mentioned in the episode:

• Higher levels of both pec and triceps in narrow (diamond) compared to wide pushups here and here
• In fact, every muscle is activated more in narrow hands here
• Absolute changes in muscle activation in pushups with different hand placement is marginal here
• People can lift more weight in a regular (wider than shoulder width) grip in bench press compared to close grip - but produce more power in a narrow grip here and here 
• But grip width does not affect how many reps you can do here or here 

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