Please could you recommend the best activity tracker for DH. He used to run a bit but due to injury I cant see him going back to it in the near future. I think he wants something to count steps (goes walking now he cant run) and see how many calories he burns off (nearly at goal weight, does 5:2). He's 56 (I'm not sure if that is relevant?!) he's got an iPad but not an iPhone. Don't want to spend £££ and it needs to be user-friendly!