Tonight on TVGN: How Zac Efron Got That Six-Pack

Zac Efron is stripping down for his new movie Neighbors, and tonight on POPSUGAR Now, we're taking a look at how his abs have evolved since his High School Musical days. Plus, we're sitting down with more of the cast of The Fault in Our Stars, and our fitness experts weigh in on whether your sleep habits are making you fat.

Check below to find your TVGN channel!