1 Rep Max

3 Act Math

Act 1


1. What is his one-rep max?
2. Write down a guess.


Act 2

3. What information would be useful to figure this out?
4. Write down some questions you have in your head right now.

Calculation Info
1 Rep Max More Data Pic
1 Rep Max Desmos Pic

Act 3


Sequel

5. How does the website calculate a one-rep max? What formula could describe it?


Update: Jeremiah found a great solution with Desmos:

Using a Desmos regression, it looks like the relationship is either cubic or quintic. https://www.desmos.com/calculator/dep61qtq48


Button

Credits: Circle of Success, Bodybuilding.com, timinvermont.com, Robert Campbell

Advertisements

5 thoughts on “1 Rep Max

  1. This is interesting. I’m not sure what standard either. I guess it depends on what you’re getting at. If you give the percent table then 6th or 7th grade. If you want kids to try to build functions then more alg 1 or 2.

    I tried to find the formula that was creating that table. Based on this none appear to match exactly:
    http://en.wikipedia.org/wiki/One-repetition_maximum

    I threw some things in desmos (https://www.desmos.com/calculator/r5tnnsaxq1). Based on what I see it looks like they may be combining some different models at different regions.

    1. Wow this is awesome work! Thanks for the feedback. I agree that there doesn’t seem to be an exact match. I’m also a little perplexed about how to input the data since there are basically 3 different factors (reps, weight used, predicted 1 rep max weight).

      Thank you for your contribution!

      1. I agree you would need two different inputs to create the output of max weight for one rep. I was also trying to figure out how to put this into a table.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s