With this average speed you should run tempo distance of 100m not above:
TempoTime = Distance / TempoSpeedAvg
TempoTime = 100 [m] / 6.849 [m/s] = 14.6 [s]

14.6 is upper limit for tempo - not a point - it is a limit, so you can run it slower!

The problem with this equation is that it is long. We will now try to reduce it. Just watch me
TempoTime = Distance / TempoSpeedAvg
TempoTime = Distance / (SpeedAvg * 0.75)
TempoTime = Distance / [(Distance/DistanceTime) * 0.75]
TempoTime = Distance / [(Distance * 0.75) / DistanceTime]
TempoTime = (Distance * DistanceTime) / (Distance * 0.75)
TempoTime = DistanceTime / 0.75

If we check it out with numerical data we will get the following result

TempoTime = 10.95 [s] / 0.75 = 14.6 [s]

So this is correct!!!
Another thing we can do is to
TempoTime = DistanceTime * (1 / 0.75)
TempoTime = DistanceTime * 1.333

If we check it out with numerical data we will get: TempoTime = 10.95 [s] * 1.333 = 14.6 [s]

Again correct!

So you have two options:

TempoTime = DistanceTime / 0.75

TempoTime = DistanceTime * 1.333

I hope I cleared all this mathematical mess!
Hope it helps!

Yes it does… thanks for pointing out my mathematical incompetance! Bizzarly, I always used the correct formula for myself (and i’ve posted it before) but when thinking about how i was going to answer this post i rethought my logic and decided i was wrong! I was talking to Nik about it before i posted… Another sign i am getting old!

duxx or anybody that knows, a question that i have about tempo and the percentages is, should you take your percentage of your personal best (best conditions, blocks, spikes, peak, etc.) or what you could run on that given day. of course it would be hard to guess, but i have always gone with what i could do in the given conditions. help!

The formula for determining tempo pace is correct, but I wouldn’t call this speed endurance work. It is recovery and general conditioning work. Your speed endurance work should be done at 85%-95%.

For tempo its just a general guideline. You can probably go up 5% and be fine so don’t worry about it. 75% is a maximum not the pace you need to keep. So if you run 100 in 10 flat then 13.4 is the maximum you shoud go at but 14 will be fine as well…

Well if you set the upper limit at your PB then you know never to go faster than this! Obviously if you ran 10.0 at 21 and are now 45 you want to adjust it relative to what you are capable of now though!

As for grass well i add on about a second per 100m because it is much more muscular due to longer ground contacts.

These are fastest limit times for tempo- not exact times to be met. also the time would be based on the same conditions, so running on grass in flats must be slower.

If doing short recovery for speed endurance, such as 3x4x60 with about 1 min. recovery between reps and about 6 min. between sets, the 85% can come into play. I agree with full recovery work at 95% or higher. My larger point was just that you wouldn’t be doing speed endurance work at 75% or less.