Which method i have to use?

Dear my friend. I am working on research on supplement. I have 4 group in creatine supplement and placebo ( creatine+ exercise, creatine+ no exercise, placebo+exercise, placebo non exercise). pre and post test was before and after five weeks. anaerobic power was measured in pre and post test.

I want to know effect of creatine on anaerobic power. I did run a anova repeted measure but some people said me i have to use mixed anova or mancova.

is it any suggestion?
Thank you for help


No cake for spunky
I assume they are saying that you need to have a repeated measures for the creatine and and also test for the main effect of exercise. Since you have only one dependent variable I dont understand why you need to do MANCOVA?