NEW YORK ( TheStreet) -- Lululemon Athletica ( LULU) is spiking after it reported fourth-quarter profit that nearly tripled and a better-than-expected 2010 forecast. During the quarter, the athletic apparel retailer earned $28.5 million, or 40 cents a share, compared with $10.9 million, or 16 cents, in the year-ago period. Analysts expected Lululemon to earn 30 cents a share. Lululemon's revenue more than doubled to $160.6 million, as same-store sales soared 29%. Lululemon received a boost from sales of its running gear. Looking ahead, Lululemon expects first-quarter earnings in the range of 18 cents to 20 cents a share, and full-year earnings between $1.00 and $1.05 a share. Wall Street is calling for earnings of 17 cents for first quarter and 96 cents for the year. Shares of Lululemon are surging 10.4% to $39.71 in morning trading. -- Reported by Jeanine Poggi in New York. Follow TheStreet.com on Twitter and become a fan on Facebook.