heavy weight training potentially causes straining, which can potentially increase intrathoracic pressure (transiently) via a valsalva manouvre, which again, theoretically can increase regurgitation though the aortic valve (transiently) - this is theoretical and lacks robust data, as very few people have Echo’s during weight training ! Sometimes physiology is extrapolation 
but, nevertheless I’d do the kettlebells, as it’s more useful for cycling than bench pressing your body weight
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