YOU SAID:
A multistage aerobic capacity test that progressively gets more difficult as you continue
INTO JAPANESE
続けるほど難しくなる多段階の有酸素能力テスト
BACK INTO ENGLISH
A multi-stage aerobic fitness test that gets harder the longer you go
INTO JAPANESE
長く行くほど難しくなる多段階の有酸素運動能力テスト
BACK INTO ENGLISH
A multi-stage aerobic fitness test that gets harder the longer you go
That didn't even make that much sense in English.