What is the best app to help build arm/chest muscle and abs?

I have the iPhone and would like to get stronger. Also I don't have any equipment.

I don't know

There's a free app called" +200 sit ups " to get a six pack and "+200 push ups" for strength the company or whatever has a lot of apps like that but some cost money

Simple Exercises with Dumbbells

You don't need to join a gym for building muscle as long as you can grab a pair of dumbbells. These seemingly humble tools can help you work-out nearly each part of your body. Some exercises that can be easily performed at home or in a park, without the need to join a gym include:
• Weighted Walking
• Weighted Lunges
• Deadlifts
• Military Presses
• Side Fly for Shoulders

Just remain dedicated to your daily routine and the results will start surfacing within a few weeks. Not being in the gym also means that you should lay extra emphasis on getting the technique right to avoid injuries.

Many guys are under the impression that going to the gym is vital for building muscle.

However, it should be remembered that physical training is not limited to the gym. Without ever entering the gym too you can increase your overall fitness and develop muscle mass. What you need is some discipline and the following tips that will help you build muscles without the fancy equipment found at gymnasiums