13 is absolutely fine for us too,i purely suggested 13-15 to be polite13-15 is fine with me as well, I'm just not sure if I can keep up with 15mph uphill and for 35m though.. That's what I said 13 to be sure!
As I said though, if that's too slow for you guys I can always stay at home! I really don't mind.. We can always arrange something for next weekend when speed might be less of an issue. Having a medical condition is well respected.

Tell her, if it comes to worse we'll take the shortcut and meet you all at the coffee shop.. 
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Are you sure it's something you can't fix once you get some YouTube advice and clear your mind?