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RSTFlex course credits make it easy for you to buy the Rossiter Stretching Level 1 - 4 courses at a discounted price and then choose any of our published live or online courses that match your schedule and location preferences. The credits can be used anytime over two years from date of purchase**. $100 Holiday Savings per Course Credit. Use Code - RSTFLEX100 ** $25 Registration Fee applicable at the time of course signup.