We know nowt about these things, any mid range recommendations?
Mrs P. has a pretty huge fell running project to aim for next year, with a bit of bike cross training. She struggles to keep to good pace on the ups (don’t we all!)

I have been using this http://www.cardiosport.com/products.html for a
Couple of years now.

Not sure this is mid-range, more like budget, but has been working well for me for 6 months for cycling only i-Got U: can’t comment on suitability for running.