I have been looking for a practical way to add more strength training to my running.
Finding exercises was not the difficult part. There are endless routines for core control, single-leg stability, glutes, calves and mobility. The difficult part came when I tried to follow one.
Do the movement. Look at the clock. Try to remember when the interval started. Stop, unlock the phone, check what comes next, start another timer, then put the phone down again.
The workout was supposed to be simple, but managing it kept interrupting the workout itself.
What I wanted was almost embarrassingly small: tell me when to start, tell me when to rest, show me the next movement and keep going until the routine is done.
A timer, not another training platform#
I did not want to build a strength-training app with accounts, streaks, subscriptions or a complicated exercise library. I wanted something I could open beside the mat and use immediately.
So we built the Runner Strength & Core Timer.
Choose a routine, press start and put the phone where you can see it. The timer gives you a short preparation countdown, shows the current exercise in large type and moves through each work and rest period. It also shows the next movement, the current round and the planned time remaining, so there is no need to keep touching the screen.
Sound cues are optional. Fullscreen makes the countdown easier to see from the floor, and wake lock can keep a supported device from going dark in the middle of a set. If I need to stop, pause excludes that time instead of pretending it was completed training.
Starting points I can change#
The tool includes a few runner-oriented starting points:
- core and trunk control;
- glutes and single-leg stability;
- feet and ankles;
- a short 20-second work, 10-second rest block;
- post-run mobility.
They are templates, not prescriptions. Every exercise name, movement cue, work period, recovery, round count and preparation time can be edited. I can use a preset as it is, remove movements I do not want or turn my own routine into a sequence that the timer can run.
The current routine stays in the browser. It can also be downloaded as a JSON file and imported on another device, without creating an account or uploading a workout.
The small technical detail that matters#
A browser timer can look correct while slowly becoming wrong. If it simply subtracts one second every time a callback fires, browser throttling or a busy device can make those callbacks arrive late. Over a full routine, the delay accumulates.
This timer checks real elapsed time instead. A 40-second exercise remains a 40-second exercise even if an update is briefly delayed. That is not the most visible feature on the page, but it is the difference between a countdown I can trust and one I still need to watch.
Removing one more excuse#
This tool does not decide which strength program is right for me, and it cannot tell whether an exercise is appropriate for an injury. The included routines are starting points, not individualized coaching.
What it does is remove a small piece of friction. Once I have chosen the movements, I no longer need to manage the clock. I can pay attention to the exercise, hear when it is time to rest and be ready for what comes next.
Sometimes the useful tool is not a bigger training system. It is the simple timer that lets the training happen.
Build a routine and try it: Runner Strength & Core Timer.