Power is a complete system

A power rhyme based on 'for want of a nail'

𝐏𝐨𝐰𝐞𝐫 𝐢𝐬 𝐚 𝐜𝐨𝐦𝐩𝐥𝐞𝐭𝐞 𝐬𝐲𝐬𝐭𝐞𝐦

It’s a system built on your individual capabilities.

And it has five fundamental concepts that work together to enable you to run your personal best.

𝐏𝐨𝐰𝐞𝐫 = 𝐄𝐟𝐟𝐨𝐫𝐭

Power represents your effort, so you can see how hard you’re working while running and how that changes as you run (whether you decide to make the change, or hills or wind force you to change your effort).

𝐓𝐡𝐫𝐞𝐬𝐡𝐨𝐥𝐝 𝐏𝐨𝐰𝐞𝐫

Threshold is a small range of effort levels, below which you can run at a steady effort, and above which you fatigue much more quickly and will need to slow down or stop.

Threshold Power is used to set training targets, to monitor training load, and to set race/event goals.

𝐏𝐨𝐰𝐞𝐫-𝐃𝐮𝐫𝐚𝐭𝐢𝐨𝐧

These are inversely related (higher power = shorter duration; lower power = longer duration).

Best effort and maximum effort runs can determine how long you can sustain differing effort levels, giving you a view of your current capability over a range of intensities.

𝐓𝐫𝐚𝐢𝐧𝐢𝐧𝐠 𝐋𝐨𝐚𝐝

Training Load Scores combine ‘how hard?’ and ‘how long?’ and represent the training load from each workout – its impact on your body.

You can combine the scores to calculate metrics you can use to monitor whether your training is productive (not too much, not too little), and to manage injury risk.

𝐑𝐮𝐧𝐧𝐢𝐧𝐠 𝐄𝐟𝐟𝐞𝐜𝐭𝐢𝐯𝐞𝐧𝐞𝐬𝐬

A speed:power ratio that you can use to estimate finish times, to assess changes to your running form and to evaluate your fatigue resistance.

𝑺𝒉𝒐𝒖𝒍𝒅𝒏’𝒕 𝒚𝒐𝒖 𝒃𝒆 𝑹𝒖𝒏𝒏𝒊𝒏𝒈 𝒘𝒊𝒕𝒉 𝑷𝒐𝒘𝒆𝒓?

Questions?
📖 Getting Started

Power is a complete system

Why power? Power can measure running form improvements

A runner looking powerful

𝐏𝐨𝐰𝐞𝐫 𝐜𝐚𝐧 𝐦𝐞𝐚𝐬𝐮𝐫𝐞 𝐫𝐮𝐧𝐧𝐢𝐧𝐠 𝐟𝐨𝐫𝐦 𝐢𝐦𝐩𝐫𝐨𝐯𝐞𝐦𝐞𝐧𝐭𝐬

Want to improve your finish times?

You have two choices:
✅ Work on your fitness – so you can run the event distance maintaining a higher effort than before
✅ Work on your form – so you can run faster for the same effort, run at the same speed for less effort, or both

𝐇𝐨𝐰 𝐝𝐨 𝐲𝐨𝐮 𝐰𝐨𝐫𝐤 𝐨𝐧 𝐲𝐨𝐮𝐫 𝐟𝐨𝐫𝐦?

You can work on your form using drills, plyometrics, strength and conditioning, mobility and other supplemental work.

𝐇𝐨𝐰 𝐜𝐚𝐧 𝐲𝐨𝐮 𝐦𝐞𝐚𝐬𝐮𝐫𝐞 𝐟𝐨𝐫𝐦 𝐢𝐦𝐩𝐫𝐨𝐯𝐞𝐦𝐞𝐧𝐭𝐬?

Running Effectiveness (RE) measures how effectively you convert power into forward motion.

It’s calculated as the ratio of speed to power = speed / power.

RE is a field-based measure similar to, but different from Running Economy (oxygen consumption at various speeds) or Running Efficiency (external mechanical power vs. metabolic power production), which both require lab-based testing.

Measure your RE before beginning your form work, then again at the end, comparing the results to see if you’ve made a positive difference to your Running Effectiveness.

𝐑𝐄 𝐜𝐚𝐧 𝐛𝐞 𝐚 𝐝𝐢𝐟𝐟𝐢𝐜𝐮𝐥𝐭 𝐦𝐞𝐭𝐫𝐢𝐜 𝐭𝐨 𝐦𝐞𝐚𝐬𝐮𝐫𝐞

Why?

It’s affected by: your power meter; your weight; how hard you’re working; hills; wind; running shoes.

One way to track RE improvements is to use reference runs.

Every 3-4 weeks, run the same route at the same target intensities wearing the same running shoes.

Reference runs provide an opportunity to compare RE from one run to the next, so that you can see if you’re improving.

𝑺𝒉𝒐𝒖𝒍𝒅𝒏’𝒕 𝒚𝒐𝒖 𝒃𝒆 𝑹𝒖𝒏𝒏𝒊𝒏𝒈 𝒘𝒊𝒕𝒉 𝑷𝒐𝒘𝒆𝒓?

Questions?
📖 Getting Started

Running Effectiveness was proposed by Andrew Coggan, PhD, and measures how effectively you convert power into speed.

Power can measure running form improvements

Why power? Power provides personal best race-day targets

A runner looking powerful

𝐏𝐨𝐰𝐞𝐫 𝐩𝐫𝐨𝐯𝐢𝐝𝐞𝐬 𝐩𝐞𝐫𝐬𝐨𝐧𝐚𝐥 𝐛𝐞𝐬𝐭 𝐫𝐚𝐜𝐞-𝐝𝐚𝐲 𝐭𝐚𝐫𝐠𝐞𝐭𝐬

Does this mean a new Personal Best (PB) at every event?

No.

Instead, power can identify race-day targets that you can maintain throughout the event to achieve the best result you’re capable of on the day.

How?

𝐓𝐡𝐞 𝐒𝐭𝐫𝐲𝐝 𝐑𝐚𝐜𝐞 𝐂𝐚𝐥𝐜𝐮𝐥𝐚𝐭𝐨𝐫

The Stryd Race Calculator uses your workouts from the last 90 days, your Auto-CP (Threshold Power) and (optionally) information about the event course and the expected environmental conditions to produce a best-case target power and an estimate of your finish time.

𝐒𝐮𝐩𝐞𝐫𝐏𝐨𝐰𝐞𝐫 𝐂𝐚𝐥𝐜𝐮𝐥𝐚𝐭𝐨𝐫 (𝐒𝐏𝐂)

Using your Threshold Power, Running Effectiveness (how well you convert effort into forward motion), a fatigue resistance measure specific to your race distance, and (optionally) the expected environmental conditions, SPC provides race power target scenarios, the equivalent percentage of your Threshold Power and estimates of your finish time.

𝐔𝐬𝐢𝐧𝐠 𝐭𝐡𝐞 𝐫𝐚𝐜𝐞-𝐝𝐚𝐲 𝐭𝐚𝐫𝐠𝐞𝐭

Power-based targets are a little different than you may be used to.

They’re based on you, not on population averages – 𝑦𝑜𝑢𝑟 current fitness, 𝑦𝑜𝑢𝑟 fatigue resistance, and 𝑦𝑜𝑢𝑟 ability to convert power to speed.

They’re a power (or effort) target, not a hopeful goal time – to quote Steve Palladino “your time is determined by the power you 𝑐𝑎𝑛 run, not by the power you ℎ𝑜𝑝𝑒 to run.”

𝑺𝒉𝒐𝒖𝒍𝒅𝒏’𝒕 𝒚𝒐𝒖 𝒃𝒆 𝑹𝒖𝒏𝒏𝒊𝒏𝒈 𝒘𝒊𝒕𝒉 𝑷𝒐𝒘𝒆𝒓?

Questions?
📖 Getting Started

Why power? Power provides metrics to manage your training load

A runner looking powerful

𝐏𝐨𝐰𝐞𝐫 𝐩𝐫𝐨𝐯𝐢𝐝𝐞𝐬 𝐦𝐞𝐭𝐫𝐢𝐜𝐬 𝐭𝐨 𝐦𝐚𝐧𝐚𝐠𝐞 𝐲𝐨𝐮𝐫 𝐭𝐫𝐚𝐢𝐧𝐢𝐧𝐠 𝐥𝐨𝐚𝐝

Your training load has two major components:
🔹 Your training balance – balancing the shorter-term and longer-term effects of your training to ensure your training is productive (not too much, not too little)
🔹 Your training progression – managing how you progress your training to avoid injury from adding too much too quickly.

Power provides metrics, based on your completed workouts, to manage your training load.

𝐇𝐨𝐰 𝐝𝐨𝐞𝐬 𝐩𝐨𝐰𝐞𝐫 𝐮𝐬𝐞 𝐜𝐨𝐦𝐩𝐥𝐞𝐭𝐞𝐝 𝐰𝐨𝐫𝐤𝐨𝐮𝐭𝐬 𝐭𝐨 𝐚𝐜𝐡𝐢𝐞𝐯𝐞 𝐭𝐡𝐢𝐬?

Power calculates a Stress Score for every workout, using the workout intensities and durations.

It uses the Stress Scores from every workout, along with your Threshold Power, to calculate training load metrics.

These metrics will be covered in more detail in an upcoming series of posts.

𝐖𝐡𝐲 𝐢𝐬 𝐢𝐭 𝐢𝐦𝐩𝐨𝐫𝐭𝐚𝐧𝐭 𝐭𝐨 𝐦𝐚𝐧𝐚𝐠𝐞 𝐛𝐨𝐭𝐡 𝐛𝐚𝐥𝐚𝐧𝐜𝐞 𝐚𝐧𝐝 𝐩𝐫𝐨𝐠𝐫𝐞𝐬𝐬𝐢𝐨𝐧?

Training stresses your body, prompting it to adapt and become fitter, improving performance.

But it’s a balance.

Stress the body too little, and it won’t adapt.

Stress it too much or progress too quickly, and it’ll break down instead of adapting.

Stress the body correctly, managing both balance and progression, and sustained long-term improvements are possible.

𝑺𝒉𝒐𝒖𝒍𝒅𝒏’𝒕 𝒚𝒐𝒖 𝒃𝒆 𝑹𝒖𝒏𝒏𝒊𝒏𝒈 𝒘𝒊𝒕𝒉 𝑷𝒐𝒘𝒆𝒓?

Questions?
📖 Getting Started

Power provides metrics to manage your training load

Why power? Power targets are clearer than pace or HR targets

A runner looking powerful

𝐏𝐨𝐰𝐞𝐫 𝐭𝐚𝐫𝐠𝐞𝐭𝐬 𝐚𝐫𝐞 𝐜𝐥𝐞𝐚𝐫𝐞𝐫 𝐭𝐡𝐚𝐧 𝐩𝐚𝐜𝐞 𝐨𝐫 𝐡𝐞𝐚𝐫𝐭 𝐫𝐚𝐭𝐞 𝐭𝐚𝐫𝐠𝐞𝐭𝐬

Which is clearer?
1. “3x 15min at 15 secs/mile slower than 10k pace with 3min easy recovery”
2. “3x 15min zone 3 with 3min zone 2 recovery between sets”
3. “3x 15min at 220W – 230W with 3min recovery below 200W”

You may think they’re all clear, but …

𝐏𝐚𝐜𝐞 𝐭𝐚𝐫𝐠𝐞𝐭 𝐢𝐬𝐬𝐮𝐞𝐬

How fast is 10k pace? I didn’t know my 10k pace when I first started running.

Does 15 secs/mile apply to all runners, regardless of their 10k pace? Probably not.

And should you maintain the pace on the flat and on hills? With no variation?

𝐇𝐞𝐚𝐫𝐭 𝐫𝐚𝐭𝐞 𝐭𝐚𝐫𝐠𝐞𝐭 𝐢𝐬𝐬𝐮𝐞𝐬

There’s no easy way to discover your maxHR. Either it’s based on your age (rather than your individual capability), or it requires an all-out 3-minute run to try to reach your maxHR.

HR target zones tend to be quite wide – 10% ‘chunks’ (a broad brush).

And heart rate lags behind changes in your effort, and drifts up at the end of longer runs.

𝐏𝐨𝐰𝐞𝐫 𝐢𝐬 𝐝𝐢𝐟𝐟𝐞𝐫𝐞𝐧𝐭

Power gets your training targets right – individualised to you and your current running fitness, and as a narrower range within training zones.

When running, just keep your lap power within the target range – on the flat or on hills.

And power responds to changes in effort – no lags and no drifting.

𝑺𝒉𝒐𝒖𝒍𝒅𝒏’𝒕 𝒚𝒐𝒖 𝒃𝒆 𝑹𝒖𝒏𝒏𝒊𝒏𝒈 𝒘𝒊𝒕𝒉 𝑷𝒐𝒘𝒆𝒓?

Questions?
📖 Getting Started

Power targets are clearer than pace or HR targets

Why power? Power gets your training targets right

A runner looking powerful

𝐏𝐨𝐰𝐞𝐫 𝐠𝐞𝐭𝐬 𝐲𝐨𝐮𝐫 𝐭𝐫𝐚𝐢𝐧𝐢𝐧𝐠 𝐭𝐚𝐫𝐠𝐞𝐭𝐬 𝐫𝐢𝐠𝐡𝐭!

Power identifies training targets, based on your fitness, that maximise training results without over-training and risking injury.

Two questions:
1. How does power identify your running fitness?
2. How does power set training targets based on your fitness?

𝐇𝐨𝐰 𝐝𝐨𝐞𝐬 𝐩𝐨𝐰𝐞𝐫 𝐢𝐝𝐞𝐧𝐭𝐢𝐟𝐲 𝐲𝐨𝐮𝐫 𝐫𝐮𝐧𝐧𝐢𝐧𝐠 𝐟𝐢𝐭𝐧𝐞𝐬𝐬?

Second-by-second as you run, power provides numbers representing your effort.

With a few maximum effort runs (no lab testing needed), you can identify your Threshold Power.

Threshold Power is an important representation of your current running fitness.

𝐇𝐨𝐰 𝐝𝐨𝐞𝐬 𝐩𝐨𝐰𝐞𝐫 𝐬𝐞𝐭 𝐭𝐫𝐚𝐢𝐧𝐢𝐧𝐠 𝐭𝐚𝐫𝐠𝐞𝐭𝐬 𝐛𝐚𝐬𝐞𝐝 𝐨𝐧 𝐲𝐨𝐮𝐫 𝐟𝐢𝐭𝐧𝐞𝐬𝐬?

Power uses your Threshold Power as an anchor, positioned at 100% on a scale from 60-65% (no longer walking) up through 200% (short sprints) and beyond.

For example, you might use:
🔹 80% or less for an easy run
🔹 94-96% for 10-20 minute intervals at half-marathon power
🔹 102-105% for 3-minute VO2max intervals

And if (when) your fitness improves and your Threshold Power increases, your workout targets adjust to match the new anchor, matching your increased fitness.

𝐈𝐬 𝐢𝐭 𝐨𝐧𝐥𝐲 𝐚𝐛𝐨𝐮𝐭 𝐭𝐡𝐞 𝐧𝐮𝐦𝐛𝐞𝐫𝐬?

No.

Training is much more than actions driven by numbers. But training should also be underpinned by quantitative data – and power can provide those numbers.

𝑺𝒉𝒐𝒖𝒍𝒅𝒏’𝒕 𝒚𝒐𝒖 𝒃𝒆 𝑹𝒖𝒏𝒏𝒊𝒏𝒈 𝒘𝒊𝒕𝒉 𝑷𝒐𝒘𝒆𝒓?

Questions?
📖 Getting Started

Your training is based on your running fitness