C25K advice again please...plus some IT support! .....grateful thanks

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Hi everyone,
I am keen to start running following a six stone weight loss
I am a daily dog walker (45 mins on average) and walk fast pacing to music on my iPhone.
I have downloaded the C25K app on my phone in readiness, but we are going on holiday soon and I know will have no internet (cruise). I intend to exercise on the promenade deck daily (plenty running/walking) but would like to start the app.
Is this possible to download and how do I do it? Can I complete it as I go along??
Will not have internet for two weeks at least.
I am sorry....such a dinosaur

Put your phone into plane mode and start the app. If it runs okay you'll be fine on the cruise. If it's the same one I've got, I suspect it will be fine but unable to record the fact you have completed that day's workout, as I would guess it syncs that to the server at the end.

I used the NHS podcast version which just saves as a file for each run.