Gallery: Get Strong, Toned Arms With These 5 Moves: No Weights Required!

Ever wonder why it might be really difficult to do upper body exercises like pull-ups and push-ups? Men seem to pull these off with just a little consistent effort over time. Are women the weaker sex? Not necessarily. 

According to Tim Hewett, director of research in the department of sports medicine at Ohio State University Wexner Medical Center, men just have 40 percent more muscle concentrated in their upper bodies than women do. This translates into about 50-60 percent more upper body strength. That doesn't mean that you cannot build strength in your arms, chest, back, and core. Quite the contrary, you absolutely can! Just ramp up your workouts and incorporate more strength training.

Many women worry about getting bulky muscles so they avoid lifting weights. Unless your genetics say otherwise, the fact that women have less muscle mass to start with makes it difficult to look like a bodybuilder overnight. If you are not convinced, give these five body weight exercises a try for lean, strong and toned arms!