Justin Bieber is currently on his Believe world tour and posted a video online proving to fans that the constant travel has not affected his ability to do impressive push-ups.

The 19-year-old posted on Twitter Tuesday a video of him backstage at one of concerts exercising before taking to the stage. He captioned the video, "Some things people write about me are just funny. I attacked the floor." The social media message was re-tweeted over 25,000 times and was a "favorite" to over 18,000 users.

Comments on the video include "That's why you're my idol" and "such a turn on."

Bieber debuted a new hairstyle over the weekend in Germany during a fan meet-and-greet. On April 5 he was photographed with a fan and the singer looked visibly different: his hair was shaved much shorter on the sides, and the top was left longer and swept to the side. See photos here.

Twitter user Justin Bieber Fan posted a picture of herself with Bieber and his new 'do. She captioned the image, "So Justin bieber is single, he is writing new music and he got his hair flip back. WELL HELLO 2009." 

Bieber had a somewhat similar side-swept look when he first came onto the music scene. 

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