@CoastalWave
Honestly, your back is NOT that bad as you're able to walk. Walk to the door. Walk to your car. DRIVE to the gym. And so on.
Ask yourself - if you were self employed and NOT GETTING PAID, would you still be merrily not working and going to the gym for a swim??
As an employer, I would think the OP is totally taking the piss.
Of course, if the OP is not being paid right now, take as much time as you need to get back healthy. Otherwise, do those things to help in your own time!
Exactly this. It's amazing how much more likely people are to drag themselves into to work no matter how 'ill' or 'in pain' they are, if they don't get paid. People tend to swing the lead a lot more when they're salaried staff and get paid for being off.
@Lavendersquare
I'm a senior manager and we do see what's on your sick note. I wouldn't be impressed if someone working for me was unable to attend work but was able to go to the gym it's a huge contradiction and shows that you can get about.
What you should be doing is speaking to your manager about your back problem and working out reasonable adjustments to your work to accommodate your need to move about to aid recovery from your back issue.
Exactly this. From what the OP has said so far, there seems to be no reason why she can't be in work. I would be VERY unimpressed by her behaviour and attitude if she worked for me.