Marc Summers has lived with chronic lymphocytic leukemia for 15 years and takes daily medication after chemotherapy stopped working
The 75-year-old still enjoys long walks and recently logged 13 miles in one day
Summers is celebrating Double Dare's 40th anniversary and says he's lucky to do what he loves, and to be alive and healthy
Former Double Dare and Unwrapped host Marc Summers says he's more than lucky to be alive after cheating death not once, but twice.
In 2010, Summers was diagnosed with chronic lymphocytic leukemia, which he tells PEOPLE he's managed for 15 years.

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