I used to run 2-3 miles a day, 4-5 times a week, typically at a 10-min mile pace.  I sustained a hip injury and after taking time off and PT I'm trying to ease back into running but find myself huffing and puffing after barely 1/4 mile.  In the time off from running I've been avidly doing crossfit workouts and feel otherwise in shape.  I did a whopping 1/2 mile in 5 min yesterday and the pace is fine with me, however, I need to steadily and carefully increase my mileage so I don't reinjure my hip nor burst my lungs that clealry need some exercise.  My goal is to get back to 2-3 miles easily with the hope of adding enough miles to attempt longer distances periodically (10K, 10M-long shot).

Am I better off to:

1. run 4 minutes and walk 1 minute for 2 miles and then increase my miles before I try to drop the walking

or

2. try to run 10 minutes a day a few times a week and then slowly increase the duration of the run, regardless of distance?

Thanks so much!