Klehner,
I would take the advice of Scott, Tinley, Allen over most exercise physiologists.
Flexibility is certainly a limiting factor in swimming, getting in a better aero position on the bike and providing a good and efficient gate in running.
You most certainly use your core in the swim, while maintaining your areo position on the bike and maintaining good form on the run.
An athlete who is good in triathlon who is not flexible and doesn't have a strong core, will perform even better if they have both. Also they will probably reduce the chance of injury.
Having a stronger core will allow you to maintain your form longer (swim, bike, run). That alone should allow for better times.
I would take the advice of Scott, Tinley, Allen over most exercise physiologists.
Flexibility is certainly a limiting factor in swimming, getting in a better aero position on the bike and providing a good and efficient gate in running.
You most certainly use your core in the swim, while maintaining your areo position on the bike and maintaining good form on the run.
An athlete who is good in triathlon who is not flexible and doesn't have a strong core, will perform even better if they have both. Also they will probably reduce the chance of injury.
Having a stronger core will allow you to maintain your form longer (swim, bike, run). That alone should allow for better times.