The culprit is mostly poor prolonged flexed postures on the bike.
What to do:
Find your neutral spine and build up the endurance of your postural muscles to maintain this position on your bike.
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Make sure your bike has been set up correctly, and regularly check your saddle height and distance to the handle bars throughout your training and race events.
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Avoid the hunched over position and over reaching on the bike
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Try straighten up into extension on the long flats on the ride.
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Pink dots on the handle bars/ watch/ Garmin to constantly remind you of your neutral spine position.