A friend asked me last week for some recommended exercise apps and after digging through my recommendations he was happily impressed with Pocket Trainer. The Pocket Trainer app has been around for awhile now and has received modest updates since. It gives you access to videos that let you choose from a range of exercises to spice up your workout. This lets you change things up from the regular grind.
All in all Pocket Trainer is a solid service/app which you can pick up in App World for $12.99