I like doing cross-training such as weights, rowing or netball. Is it ok to substitute some runs for some cross-training sessions and, if so, how many actual runs should I be doing a week (minimum)?
Unfortunately there is no substitute for getting out there and running. Cross training is great, but it isn't a replacement for running sessions, but more as an addition.
You must focus on getting 'time on your feet' and not worry about rowing machines, or weights, unless that is you have time to do multiple sessions a week. How many runs a week you do depends on the distance of your chosen event and your target time.
Ideally if you're running the half for example you'll be doing 3 or 4 sessions a week with the emphasis on the long run at the weekend. Follow a training plan that matches your requirements. Good luck!
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