I find the M7 processor in my iPhone 5S to do 90% of what I want. The only other time I care is when I'm directly using gym equipment, and I use an old polar w

I find the M7 processor in my iPhone 5S to do 90% of what I want. The only other time I care is when I'm directly using gym equipment, and I use an old polar watch for that (since it interoperates with the machines and hrm strap).