You can switch between levels if there are exercises in the next level that you think you can do safely. Wear sensible footwear, keep some water to hand and keep a sturdy chair next to you for stability if you are not used to exercising.
Seated march with knee tap
Seated march with shoulder tap
Seated side rock
Single leg balance
Arms crossed stand eyes closed
Standing turns
Single leg balance with reach
Single leg balance 3-way reach
Balance with arm reach