Days after going for a run in LA [1], Justin Bieber is at it again with another shirtless [2] jog. On Saturday, the "Purpose" singer showed off his impressive physique as he hiked in Runyon Canyon. Justin is currently getting ready to hit the road again for his Purpose tour, and his first stop will be in Iceland. Earlier in the week, he appeared on BBC Radio 1's Live Lounge and delivered an acoustic performance of his recent hits [3], including "Cold Water." In addition, Justin also covered Tupac Shakur's "Thugz Mansion" and Tracy Chapman's "Fast Car [4]" and absolutely killed it.