Justin Bieber has bulked up a great deal since he first entered the music industry in 2008.

The singer visited Access Hollywood Live in 2012 and spoke about how he toned up his body over the years. He said that he plays a lot of basketball and also trains every morning.

"[I'm doing] different things and work outs," he said. "We do a lot of body weight stuff, just trying to get some guns going on."

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The 19-year-old has made it a point to show off his muscles to his millions of Instagram followers. Many of his posts include shirtless photos of himself. These photos also show off his many tattoos. One ink job, located on his left shoulder, is dedicated to his grandfather.

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"My grandfather always took me to the Stratford Culliton [games] every Friday night," Bieber tweeted in January. "This is for u Grampa."

His other tattoos include an owl on his left arm, praying hands, the symbols "I, IX, VII and V", a dark-haired angel and several more to total 20. His most recent one is a bible verse on his right shoulder blade.

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Scroll through our gallery to see Bieber's shirtless photos.