What it is:
There are various apps available that can track, plan, and instruct your weight lifting routines.
How it works:
While there are dozens of apps to choose from, most worthwhile apps have the following features:
Journal for progress
Suggested routines/lift pairings
Instructions for lifting techniques
Why it works:
While it seems very basic, using these apps helps one stay honest and track progress. The point of weightlifting is to get better every week, and these help monitor those #gains (progress is a terrific motivator). Additionally, they can be a great reference when trying new lifts or breaking up the routing
Where to learn more:
For iphone, I use the Strong app, as it has everyone one could want (for free!)
The JEFIT app is also a great resource I use often, as it has great tracking and reporting tools.