Analyst and Olympian Ato Boldon joins the show and discusses Allyson Felix's transition to the 400, the escalating trash talk between Ryan Bailey and Warren Weir, Asafa Powell's last stand, the Jamaica/US rivalry, Usain Bolt's ceiling and all the other happenings in the sprint world.

Then, Jason and Kevin give a quick preview of a busy weekend in track and field and touch on the Hoka One One Mid-Distance Classic as well as the Diamond League meets in Doha and Shanghai.

Jason and Kevin discuss the American men upsetting Jamaica, Ryan Bailey's post-race celebration, Kenya's struggles, Sanya Richards-Ross's twin golds, the return of Tarmohgeddon and all the other highlights from the World Relays.

Jason and Kevin discuss Eliud Kipchoge's ascendence into the top tier of marathoners, Tigist Tufa's surprise victory, Wilson Kipsang's future, Geoffrey Mutai's outfit and all of the other highlights from the London Marathon.

Then, the guys review a busy week on the track and chat about the results from the Penn Relays and Drake Relays and look forward to this weekend's Justin Gatlin/Usain Bolt match-up at the World Relays in the Bahamas.

Jason and Kevin discuss the victories by Lelisa Desisa and Caroline Rotich, the surprising performances from Americans Dathan Ritzenhein and Desiree Linden, the eventful final miles of Meb Keflezighi and all the other storylines from the Boston Marathon.

Then, the guys talk about Usain Bolt's historically slow race, Molly Huddle and Ben True's American records and Sunday's London Marathon.

Jason and Kevin preview the Boston Marathon and run through all the major story lines including: Is there a true favorite in either race? What are Shalane Flanagan and Meb Keflezighi's chances of winning? Which other Americans are poised for a breakthrough?

Then, the guys recap Usain Bolt's first 200 in two years, Kirani James's debut, another curious decision by Athletics Kenya and read listener email.

Jason and Kevin reconvene and discuss the results from the World Cross Country Championships, Carlsbad 5,000, Florida Relays, CARIFTA Games and the Stanford Invitational.

The guys also talk about Liu Xiang's retirement, Usain Bolt's busier racing schedule, selfies during cross country races and a failed world record attempt in Qatar.

Olympian and American half marathon champion Diego Estrada discusses his success on the roads, representing the United States, training at altitude, being coached by Joe Vigil and the power of his hair.

Jason and Kevin chat about Mo Farah's fast half marathon, Nike sponsoring Justin Gatlin, David Rudisha's Australian tour and the upcoming World Cross Country Championships.

Jason and Kevin discuss Ryan Hall's struggles, Edward Cheserek's magnificent mile, Oregon's distance dominance and the 2015 debuts of Usain Bolt and David Rudisha.

The guys also chat about Portland's green track, Kaylin Whitnety's decision to turn professional and Kenenisa Bekele's scratch from the London Marathon.

Jason and Kevin recap the European Indoor Championships before previewing the NCAA Indoor Championships with the help of Kyle Terwillegar and Dennis Young of the USTFCCCA.

Then, the guys discuss Sunday's Los Angeles Marathon, Jamaica's newest phenom and an early nominee for the worst rabbit of the year.