The science of structured running
You track every run.
Give each one a purpose.
Turn your training paces into sessions you can follow. Build the workout in RunSync, send it to Garmin and let your watch guide the effort.
For runners who train with Garmin.
- Clear targets
- Planned recovery
- Watch-guided sessions
What the research shows
Structure can make a measurable difference.
Studies in recreational runners show that specific interval programmes can improve race performance. Here are two examples with the numbers and context attached.
Reported 5 km time improvement
Seconds faster
View study data and limitations
| Study | Interval group / total | 5 km improvement | Study context |
|---|---|---|---|
| Gunnarsson & Bangsbo, 2012 | 10 / 18 runners | 48 seconds in 7 weeks | Small controlled study of moderately trained runners; the control group continued usual endurance training. |
| Gliemann et al., 2015 | 132 / 160 runners | 38 seconds in 8 weeks | Controlled community-running study with unequal groups; two of three weekly sessions were replaced by intervals. The abstract reports no changes in the control group. |
Both papers come from overlapping research teams. They tested a particular protocol, so their results should not be generalised to every structured workout. The chart does not estimate the difference between intervention and control groups or show uncertainty around the changes.
There is no single magic training split.
In a ten-week trial with 30 recreational runners, two planned training approaches improved 10 km times by 5.0% and 3.6%. The difference between groups was not statistically significant. [3]
A 2025 review of 13 studies involving 348 endurance athletes found no statistically significant overall advantage for polarised training over the other distributions compared. The studies covered different sports and experience levels; no clear winner does not mean every approach is equivalent. [4]
Choose a mix that fits your experience and goal. RunSync helps you turn the sessions you choose into clear steps and targets.
From data to decisions
Make the numbers useful before you run.
A clear session tells you what you are aiming for while you are out there.
Scroll the table to compare each training decision.
| Training decision | Without a clear session | With RunSync |
|---|---|---|
| Effort | Decide as you go | Set pace or heart-rate targets |
| Intervals | Remember reps and rests | Build repeatable work and recovery steps |
| Execution | Keep checking the plan | Follow the session on your Garmin |
Easy runs can be structured too. A target and a purpose can be enough. Regular running is valuable, and you can improve without an app; RunSync makes planned sessions easier to build and follow.
Explore structured running workoutsFrom intention to execution
Your goal. Your paces. Your next session.
- 01
Find your paces
Use a recent race result to estimate training targets. Adjust for conditions and how you feel.
Calculate training paces - 02
Build the session
Set the work, recoveries, warm-up and cool-down. Use your existing plan or build a session around your goal.
Open the workout builder - 03
Send it to Garmin
Follow the steps from a compatible watch, then review your completed activity in Garmin Connect.
Check watch compatibility
A few useful answers
Structure that fits your running.
Do easy runs count as structured training?
Yes. A structured run can be as simple as an easy effort with a time or distance target. Structure means deciding what the run is for and how to approach it; it does not mean every session needs intervals.
Do I need intervals on every run?
No. The studies here tested specific training programmes, not a recommendation to run hard every day. Choose a balance of easier running, harder sessions and recovery that fits your experience and goal. Build up gradually.
Will RunSync make me faster?
RunSync helps you build and follow structured sessions. Your progress depends on the programme, consistency, recovery and your individual response. The research on this page tested training methods, not RunSync, and cannot predict your result.
Can I use my existing training plan?
Yes. Build the running sessions from your existing plan in RunSync, including warm-ups, work intervals, recoveries and cool-downs. Set the targets you need and send supported workouts to a compatible Garmin watch.
Put your next session into practice
Give your next run a purpose.
Build free without an account. Free includes 3 running Garmin syncs per calendar month (UTC). Sign in and connect Garmin to sync.
Saving workouts and training paces requires Run or Complete. Calendar planning requires Complete. Compare plans.
For runners who like the details
Read the research.
A focused selection of research on training methods. Study results describe groups of participants and cannot predict your individual progress.
Gunnarsson & Bangsbo (2012). The 10–20–30 training concept improves performance and health profile in moderately trained runners. Journal of Applied Physiology, 113(1):16–24.
DOI: 10.1152/japplphysiol.00334.2012Gliemann et al. (2015). 10–20–30 training increases performance and lowers blood pressure and VEGF in runners. Scandinavian Journal of Medicine & Science in Sports, 25(5):e479–e489.
DOI: 10.1111/sms.12356Muñoz et al. (2014). Does polarized training improve performance in recreational runners?. International Journal of Sports Physiology and Performance, 9(2):265–272.
DOI: 10.1123/ijspp.2012-0350Rosenblat et al. (2025). Which Training Intensity Distribution Intervention will Produce the Greatest Improvements in Maximal Oxygen Uptake and Time-Trial Performance in Endurance Athletes? A Systematic Review and Network Meta-analysis of Individual Participant Data. Sports Medicine, 55(3):655–673.
DOI: 10.1007/s40279-024-02149-3
Research checked 8 November 2026. Research supports training methods; RunSync helps you put them into practice.