Liftosaur

Liftosaur allows you to implement any possible weightlifting program using a simple scripting language - Liftoscript. It works this way: each exercise may define a bunch of variables, that could be changed when you finish a workout. It could be weight, your 1 rep max, number of successful attempts, etc. You can use those variables in reps and weight values. To update the variables, you define a script, that will change them after you've done all the sets of the exercise.

The app contains a bunch of built-in programs, and has all the features you’d expect from a weightlifting tracker - progress graphs, history, cloud storage, rest timers, warmups, etc, etc.