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Shares of Planet Fitness

plunged more than 30% Thursday after the company reported a drag on sign-ups and trimmed its guidance.

The stock was having its worst day ever Thursday, as of midday trading.

Even though the fitness company saw 21.9% revenue growth in its first fiscal quarter and same club sales increased by 3.5%, CEO Colleen Keating said the company saw a “slower than expected start from a net member growth perspective.”