"I'm thinking about trekking to Everest base camp," Biel, 28, told PEOPLE Saturday at the 13th Annual EIF Revlon Run/Walk for Women in New York's Times Square. "That's kind of the next goal."
In January, Biel scaled Africa's tallest peak, along with actor Emile Hirsch and members of the United Nation Foundation, to raise awareness and funds for the global water crisis. And while she's hoping to tackle another summit – or at least its base – the star admits she hasn't continued her pre-climb training.
"I'm not keeping up the same type of workout because it was a little different than what I normally do," Biel says.
Instead, the athletic actress took on a slightly more manageable endeavor this weekend: a 5K. The Revlon Global Brand Ambassador co-hosted and walked to support breast and ovarian cancer research, a cause close to her heart as her grandmother is a cancer survivor.
"I think about her," Biel says, "and she is my inspiration today. When someone is close to you it's quite a personal experience, even if you're not the one necessarily going through it. But it affects the entire family."