Among them, push-ups and squats are widely used. The former works by distance sensing. Put your mobile phone under your head and start doing push-ups according to its plan. The program will count automatically, and the latter works by gravity sensing. The latter two are not used much.
Every app has a built-in training plan, and you can exercise according to those built-in plans. It's really good.
In addition, I also recommend his Runtastic Six Pack: iTunes App Store's Runtastic Six-Pack Abdominal Muscle Software: Abdominal Muscle Coach, Exercise and Customized Exercise Plan, which is really good to use on the Pad.
His software is restricted from time to time, and many of mine started when it was restricted, and each software has a free version. You can try the free version first and then buy the pro version.