Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to start barefoot running [title] Start with thirty minutes of barefoot activity a day for 3-4 weeks. [step] This will give your feet a chance to develop thicker skin for running at higher speeds and for longer times. Start by just walking, then jogging, then running, but limit the activity to thirty minutes a day at first.

Ending1: [title] Incorporate a light run into your workout. [step] Start by walking your feet into the running position for 15 minutes every 10 days. Ending2: If you transition too quickly, you may develop plantar fasciitis. [substeps] Walk for a few minutes to allow your feet to get familiar with the surface. Ending3: When you see results, loosen your arms to help you move more freely. Your feet will eventually get thicker as you progress. Ending4: Eventually, you'll be able to increase your running pace to between 30 minutes and 45 minutes a day. [substeps] It may be possible to start barefoot.

Answer format: ending1/ending2/ending3/ending4