Alex Rodriguez has celebrated a personal achievement alongside his ex-wife Cynthia Scurtis.MORE: Alex Rodriguez makes barbed dig at Ben Affleck The sports star took to Instagram over the weekend to share an upbeat post about his fitness journey.Alex had taken part in the 54D nine-week workout programme, along with his family and friends, and he's never felt better! VIDEO: Are Ben Affleck and Jennifer Lopez getting back together for good?In a lengthy Instagram post, A-Rod explained: "54D - That's