Lewis is in Arusha, Tanzania to raise money and awareness about the need for clean water in East Africa. The climb is scheduled to run from today through July 8.
Prior to the climb, Lewis and the group have been giving hearing aids to children in a nearby village as part of the TackleKili mission for World Serve International and Pros for Africa.
Via the @TackleKili Twitter account, Lewis is shown outfiting children with the hearing aids.
On his Twitter account today, Lewis posted: "To give someone hearing for the 1st time in their life is Life changing."
Lewis, 38, a two-time NFL Defensive Player of the Year who retired after winning his second Super Bowl with the Ravens, now works for ESPN as a football analyst. He issued a statement last month about his involvement in the climb.
“In one month, I will climb Mt. Kilimanjaro in Tanzania to raise money and awareness for clean water projects in East Africa," Lewis wrote. "I am so FIRED UP for this adventure, but until then, I need your help to bring clean water wells to thousands of children and families. Show your support by following my TackleKili journey, spreading the word, and donating to TackleKili.”