Just lift some of the smaller plants, runners, and either pot them up or if the friends are local wrapped in wet newspaper. You may want to clear out the whole bed and keep some of the runners for yourself as after four years the old plants will be coming to the end of their useful productive life.

And don't forget to plant your new runners/plants in a different bed as strawberries can build up viruses in the soil if grown in the same spot after a few years.

Good point Jimmy

Ah .... I didn't know that. Moon Grower I'm sorry if I sound silly but do I just cut the runners off the bigger plant ? Will that not harm them ? And Jimmy what kind of veggies would it be OK to plant in the cleared out strawberry patch (i.e. Is there anything that I should avoid planting in there ?)

So long as the runners have rooted yes simply cut them off the mother plant, which is likely t one coming to the end of its useful life.