I'm not a Mac person, but I did transfer my father onto a Mac mini. I did it mainly to avoid virus problems, since his Windows 95 box was getting a bit iffy, and I thought it would be easier to just transfer him onto a platform which was much less like to suffer from attacks.
For him it was easy enough, since he only really uses email, word processing, and a little bit of spreadsheet. I put the Mac version of Office on there (he was previously using some cut down versions of Office for Windows, I forget the name). This was reasonably familiar, but costs almost as much as the Mac mini itself. I <cough> acquired it somewhat cheaper.
The modern Macs can be set up to dual boot using
Boot Camp, or you can run some sort of virtual machine software, to emulate an Intel machine under MacOS. Potentially specific hardware, like the interface to your Polar Bike computer, may have issues with either solution, hardware device drivers tend to be the most problematic with any unusual OS configuration (Windows and Unix types). It's possible MS Project might exist in a MacOS version, since most Office apps do, but you'd have to check.
I found the Mac to be rather nice to use, but since I primarily use Windows and Unix boxes (Solaris and Linux), running Mac machines at work or home would just make my life more complex. Luckily with him, the machine just works, and I've never had to do anything significant to it, aside from occasionally make sure the software has been updated, and explain to him how to use some function which he's forgotten how it works (he's 76, if he hasn't used something for 6 months, he's likely to not remember how to do it).