If you don't want to get out and be sporty on the planks, you can get on the runners (tobogganing). Fun for all ages guaranteed!
And winter hiking makes people happy. Time for yourself or with your partner/family, balance in the physical (and often also spiritual) movement and enough fresh air on the many winter hikes create peace and serenity in your spirit.
And if you want to really take it easy, take a horse-drawn sleigh ride in the Großarltal and get close to nature that way.