In response to that previous comment, it should be noted that by using Anki daily, you will increase blood flow and connectivity in the hippocampus region. In turn, this will increase the amount of things that you can learn in a time period. I've been able to increase my new card count and review count over time without too much drain, and I answer questions far more quickly than I did when I started.

It's my daily gym activity for my brain.

I actually do Anki cards while at the gym, so I combine my physical and mental workouts ;)