DeNA Channel official channel has uploaded a video of AKB48 Marathon Club which said the club re-starts activities. AKB48 Marathon Club is sponsored by DeNA Running Club.
AKB48 Marathon Club official page:
AKB48 "Marathon Club" resumes activities
On the other hand AKB48 Marathon Club has new collaboration campaign with MYCODE, details please visit official page: https://mycode.jp/landing/akb.html