Str is a minimalist strength-training app that makes maximizing your strength as easy as possible. Unlike other workout tracking apps, Str sticks to known strength-building protocols that work. Pick a routine, and let Str handle your tracking.

The core routine in Str is based on the Starting Strength protocol by Olympic coach Mark Rippetoe (http://startingstrength.wikia.com), and is built around three sets of five reps for most exercises to maximize strength building. (If you'd prefer to switch to a different routine, Str also supports related protocols: Practical Programming, Onus Wunsler, and Wichita Falls.)

When you launch Str, the number of sets for each exercise are predetermined. Simply tap to mark how many reps you accomplished in each set, and log your workout. Not only will Str automatically identify the exercises to do the following session, but it will increase or decrease an exercise's weight based on your progress to date.

Forget about doing math in your head - let Str calculate your loads as well as your warmups, automatically rounding decimals to ensure your recommended weight can actually be loaded on the barbell. Not only does Str calculate your working loads, but Str also calculates your warmup loads, and even breaks down how much weight to add to each side of the bar! (Tapping on an exercise name brings up this info.)

At first launch, Str is set up for those new to the Starting Strength program. If you've already been on the Starting Strength program, however, you can manually override the recommended loads to jump up to your current working weight. You can even adjust the automatic increments for each exercise if you're starting to stall.

Str lets you switch between pound and kilogram labels depending on your preference. Str even lets you view stats and graphs of your progress! A dark theme is also included for those who want to match the app to their choice of iPhone color.

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