There are two reasons:

  1. 🗓  We relate real steps – just like other pedometers – to calendar days. We want the same to be true for virtual walking – each day you can virtually walk just as much as you walked in real life.

  2. ⭐️ If players could accumulate energy, there would be sudden shifts in the Seasonal Leaderboard (e.g. if someone decided to walk all their ⚡️ energy on the last day of the month).