How do you log crunches etc?

Hi,

I have recently joined a gym and apart doing some work on a stationary bike and a summit trainer, 3 days a week I also do a session where I do crunches, planks, squats etc. for about 30 -35 mins, then some stretching for around 5 mins.

How am I supposed to log it?

I just started a 3rd week and in the first week i have lost 2,7 kg and the last week 1.3 kg instead of 0.5 kg a week.

I will appreciate any advise.

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