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For reasonable accuracy (off the top of my head), 1 mile = 1.61 km, 0r 1km = 0.62 miles. So 10 miles = 16 km / 10km = 6.2 miles.
Some rougher approximations which come in handy for on-the-fly estimates:
3 miles = (a little under) 5km
5 miles = 8km
Commit these to memory and you get the hang of things pretty quickly.(Not to mention 26.2 miles = 42.195 km, always a handy one to remember!)
If your Garmin 235 is like my 220, you can pre-set intervals/rest periods of either distance or time, under :
Training>Intervals>Edit -
Also, I have a Garmin Forerunner 235. Is it possible to set it up in some way, so it beeps / laps with the times I give it for laps / reps etc?
You can setup more complicated workouts on the Garmin Connect website (Training -> Workouts) and then sync them to the watch (via the app on your phone). I do this for my interval training, see example pic:-
I'm going to give the 20m 5k training plan a go.
Does anyone have a handy miles to km per min pace converter?
Also, I have a Garmin Forerunner 235. Is it possible to set it up in some way, so it beeps / laps with the times I give it for laps / reps etc?
Cheers