I have a group of friends that I holiday with. One in the group isn't particularly fit, she won't do much that is active and the rest of us like to hire bikes, go on a hike etc, go for a run, swim in a lake. Usually this isn't a problem as we will go on a City break. However, we have been doing more active trips which we invite her to...the trouble is we seem to go through a charade of her saying how excited she is to go and then backing out. In the last couple of years it's happened a lot. She will never say it's because she doesn't like the activity. An example is that a few of us went hiking in Iceland, she made an excuse not to come saying she would have loved to go hiking there. It's really annoying, there's a list of things she would "definitely do" but has turned down, such as Hiking Mont Blanc, Skiing. Because she doesn't say that it's not her thing or similar we go through looking at hotels to include her, working around dates to include her and then she will say she can't go, not that she has changed her mind but that she can't go often with no reason or a fairly lump one.
Anyway, now we are arranging trips without her and I feel quite mean about doing so. I don't really know how to deal with it.. Any suggestions...