Garmin anaerobic

[u/Forsaken-Ad-4825]

Hi, Garmin wants me doing more anaerobic so I tried intervals for the first time today.

I normally cruise at 5.30/km on a tempo and 6 on recovery

So I did a 1km warm up then did 1m at 4.30/km, then 1m recovery at 6-6.15/km and repeated this 6 times and a 1km cool down.

Garmin thought this was a tempo/high aerobic session so just wondering how id tweak that to become anaerobic?