Dick Van Dyke's exercise routine put fans to shame as they joked about the Mary Poppins' star's energetic routine ...

"Wouldn't it be funny if I did that," he continued as he jokingly ... it's in the right… city." Van Dyke then proceeds to dance barefoot in a way only he knows how - with a smile on his face ...

Dick Van Dyke, 99, shared a video on his Instagram of him hitting the gym and tackling leg day. See the video and how fans reacted.

What I did was exhaust myself ... interview clips and family archival footage interspersed with shots of Van Dyke's dancing and a big get together with the Hollywood legend's family.

"I did a story when he turned 90 with him ... In addition to his workouts, Van Dyke is still dancing, too. Days before his 99th birthday, he appeared in the music video for Coldplay's track ...