[brc]

What about GPS based inputs - ie, you know where 'work' is, and you know where 'the gym' is. And the shops, etc. You could allow GPS tagging of certain locations and then perhaps track visits to same, reducing the amount of data input needed. I'm not too familiar with iOS, so I'm not sure if this can be done without the app running in 'foreground', though. You could also do this with speed - ie, constant 6 kmh is 'running - exercise', or a constant (average) 60 kmh is 'driving' or 'commuting'.

[SimonEschbach]

I love this idea! There is no reason to not use GPS since all of the devices support it now anyways. Thanks for the ideas!

[consultutah]

The reason not o would be battery life. I'd hate it if I had to recharge my phone every 2 hours.