Both known for their intensive fitness regimes on social media, the banter between Rio Ferdinand and Real Madrid star Cristiano Ronaldo continued as the ex-Manchester United defender responded to his former team-mate's online trolling.
Often seen posting clips of himself training on either Twitter or Instagram, despite retiring in 2015, the buff Ferdinand - now a television pundit - was at it again, but this time the 37-year-old caught the attention of a bemused Ronaldo.
In a video posted on Instagram, Ferdinand showed himself weight training in his backyard before he was mocked by Ronaldo, who commented: "WTF is that??????".
Ferdinand - who won three Premier League titles and the Champions League during Ronaldo's successful six-year spell at United which came to an end in 2009 - hit back at the 31-year-old Portuguese with a jibe of his own, adding: "Cristiano [Ronaldo] you need this in your life.
"You need a strong back and core at your age now!
"I wish I had done this stuff when I played!"
Not done there, Ferdinand then responded again on Tuesday, this time via video form to his 1.7million Instagram and 7.27m Twitter followers with another workout, especially for Ronaldo.