An email to a friend and the response

I would be pleased if any expert correct the mistakes. Thanks!
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E mail to a friend and its response

Dear Alice,
It feels like a long time since we met at any gym.
I hope you are well and life is good for you.

I'm just dropping you a line because, as you know, I've just got the aerobic instructor certificate and the first thing I have to do is give a perfomance with a few followers dancing my step coreography in order to be hired by the state-of-the-art gym placed in the city centre.

I know you are busy, as ever, but how do you fancy coming along with me? What do you prefer, as public only watching or as a follower?

I know you are very keen on any sporting activity, especially step aerobic and I thought of you straight away once I've been communicated the idea, mind you!

Let me know if you are free on Saturday 16th, but failing that I could manage 23th.

I hope you can make it.

All for now,

María.

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Hi María,

Lovely to hear from you!. I've been meaning to get in touch for ages but amid you moved to another flat and I changed my mobile number, it was imposible for me!

First of all, congratulations for the certificate and your new job!

And regard to the invitation, I have to tell you that I'm injured due to take fitness to the extreme -nothing serious, don't worry-
Doctors say I'll get over it if I only swim. High impact sports such as step aerobic and jumping rope are contraindicated.
It's a pity because I am a big enthusiastic of all these activities.
Anyway, I'll be off work on Saturday 16th and I could be there as public only watching and of course cheering you up as long as you pick me up as I have to carry on my crutchs.

If it is ok, see you then on 16th and good luck, beforehand!

Lots of love,

Alice.