Biel, alongside a number of celebs, is taking part in the Summit on the Summit climb to raise awareness and $$$$ for the clean water crisis.
Supporters have pledges a dollar for every foot Jess scales, and apparently Biel is not doin' too shabby!
The avid fitness fan is reportedly "more than holding her own" on the climb!
But will she make it to the peak?
[Image via WENN.]