What did researchers Ntoumanis, Healy, Sedikides, Duda, Stewart, Smith, & Bond (2013) find when they tested how motives impact goal pursuit?

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Researchers Ntoumanis et al. (2013) found that internal motivation results in longer persistence than external motivation. They did not find that being motivated by coaches and parents is vital in achieving goals nor did they find that external motivation drives athletes more than internal motivation.

What Did Researchers Ntoumanis, Healy, Sedikides, Duda, Stewart, Smith