You don't have to go through the door till your ready and able to cope with that,start off by watching a Zumba GOLD class on you tube.make sure it's GOLD,then every morning put your music on and do the stretching and easy movements you will learn when you watch the video on you tube,it's great fun it's easy you've no one to answer to.
you rest when you need to don't push yourself too fast it's better to do a gradual build up,then when your ready join a Zumba GOLD class locally it's such fun,no competitiveness,just good old fun you'll really enjoy.make it fun and you'll enjoy I do it every day in my lounge it'll improve your balance and co ordination and protect you against falls.good luck ladies xx