Watch: Lance Armstrong says he's done lying in '30 for 30' trailer

TERRAMALL, COSTA RICA - NOVEMBER 02: Lance Armstrong of the United States rides up a hill during day 2 of La Ruta de Los Conquistadores on November 2, 2018 in Terramall, Costa Rica. La Ruta de Los Conquistadores is Costa RicaÕs premier mountain bike race, and one of the most difficult races in the world. It is a 3-day stage race that crosses Costa Rica from the Pacific Coast in the west to the Caribbean coast in the east. Between its sea-level start and finish, the 161-mile route crosses 5 mountain ranges that force you climb a cumulative 29,000 feet. The route snakes through tropical rain forest, 12,000 feet volcanoes, banana plantations and tiny farm towns. It covers every imaginable riding surfaceÑ single track and fire road trails, gravel, hard-packed dirt, pavement, thigh-deep mud, sand, volcano ash, and more. The race was started in 1993 by Roman Urbina. Urbina, an elite athlete and adventurer, read about three Spanish Conquistadors, Juan de Cavalln, Perafn de Rivera, and Juan Vsquez de Coronado, who in the 1560Õs began a 20-year journey through the beautiful and treacherous mountains of Costa Rica. Captivated by the history of the Spanish Explorers, Urbina and 17 fellow riders met on the shore of the Pacific and began their own quest through and around the lavish rain forests, majestic volcanoes, spectacular mountain ranges and roaring rivers.

Ezra Shaw / Getty Images Sport / Getty

ESPN has shared the first look at its upcoming "30 for 30" documentary on disgraced cyclist Lance Armstrong.

The trailer for the two-part series, titled "LANCE," features Armstrong mulling a question about "the worst thing" he did and concludes with him vowing to tell his "truth."

"LANCE" will document Armstrong's rise to global superstardom, his battle with testicular cancer, and the doping scandal that led to him losing his seven Tour de France titles. It includes interviews with Armstrong, family members, teammates, friends, rivals, and journalists.

Part 1 of the series will premiere May 24 at 9 p.m. ET followed by the second installment on May 31 at 9 p.m. ET.