Kastor and his wife Deena own the California club that boasts a strong professional lineup.
The 25-year old took over 13 minutes off her 26.2-mile personal best at last weekend's ASICS L.A. Marathon.
The club will be renamed the ASICS Mammoth Track Club.
The 23-year-old is excited for professional half-marathon debut at Rock 'n' Roll San Jose on Sunday.
The 24-year-old recently joined the Mammoth Track Club.
Olympian Amy Hastings is a runner worth watching in 2013.
The fastest American half marathoner of all-time returns to action on Sunday at the Rock 'n' Roll Los Angeles Half Marathon.
We recently caught up with the Olympic Trials 1,500m champion.
He is looking to pick up a sponsor with a decent showing in New York this November.
The Mammoth Track Club's Bob Larsen thinks so.