Yasso 800's: the good, the bad & the ugly!

If you’ve ever done a marathon or been involved in distance running for a number of years you’ve probably heard of Yasso 800’s. If not, here’s a quick synopsis. Bart Yasso, the Chief Running Officer of Runner’s World magazine, “invented” the Yasso 800’s where he suggests that if you can run 10 x 800m in the roughly the same time (in minutes and seconds) as your goal for the marathon (in hours and minutes) AND you have trained correctly for the marathon, you should be able to achieve your goal time. So, if you want to run a 3-hour marathon, you run 10 x 800 in 3 minutes. A 4-hour marathon would equate to running the 800’s in 4 minutes and so forth. The rest or recovery period should be equal to the interval you just ran, so if you ran your 800m in 3 minutes, your recovery period will be 3 minutes.

Sounds good, right? Well, yes and no.

The good:
One of the main advantages of following a Yasso 800 plan is that it is easy to remember and easy to implement. There’s not much planning involved, if you want to run a 3hr30 marathon, go to the track and run 10 x 800m with each 800m being completed in 3min30, easy! And with the Yasso 800’s you don’t need a coach to tell you specific paces or split times or reps, just go out and do 10 x 800m at your goal pace (building up from 4 or 5 x 800’s to 10 over a period of a number of weeks). In essence, this is a great-uncomplicated go-to session when you just want to get a decent session done without putting too much thought into it.

The bad:
For all the good points, there are several negatives about the Yasso 800’s. Intervals are designed to stress the Vo2max system and are traditionally best done somewhere between 3 and 5 minutes at a pace that is between your 3km and 5km pace, the Yasso 800’s are definitely not that! Essentially the 800’s are a set of slow-ish intervals that are slightly too short (perhaps 1200m and 1600m intervals are more relevant) and slightly too slow to really stress your Vo2max system.

Yasso also recommends building up to 10 repetitions of the 800’s from 4 and building week on week. Indeed it is good to build up steadily, but unless you are a complete novice to faster paced running I wouldn’t recommend wasting your time building up over many weeks your Yasso 800’s. If you only do one session a week of faster paced running, like many people do, you want to make sure you’re getting the best bang for your buck and I’m afraid the Yasso 800’s are simply not that (for the reasons stated above). You could easily spend 6 or 7 weeks building up to the magic 10 repetitions, but this period of time could be spent far more wisely doing other more marathon specific sessions.

The ugly:
Yasso recommended this protocol as a good predictor of your finish time, so if you can run 10 x 800 in 3 minutes and have trained correctly for the rigours of a marathon, then a 3-hour marathon should be achievable. Yasso suggests that you can determine your performance potential at an endurance/stamina-based event (the marathon) by successfully completing a faster paced workout. This doesn’t sit well with me and most running experts agree that Yasso’s prediction is out by anywhere from 5 minutes to 25 minutes. Which means that if you actually run at the pace that the Yasso protocol “predicts” you could go through the half way mark of the marathon much quicker than you should be (or are capable of), which will almost certainly lead to a painful, slow second half of the marathon.


To surmise, the Yasso 800 protocol is a decent go-to track session if you don’t have a coach to tell you what training you should be doing, or if you simply want to turn your brain off and get a track workout in. But it’s not the be-all and end-all, I certainly wouldn’t use it to predict a marathon finish time and I can think of many more effective training sessions that would prepare the athlete for the demands of such a long endurance event such as the marathon.

Enjoy your training!