it drains energy from your body. you won't do as well in the event you're trying to do, whether it is training or racing. typically we focus on our breath because it is there in the present moment, keeps us in the present moment like an anchor. soind of your feet hitting the ground could be your anchor to present moment. also present body sensations, wind on your face or across my arms. i can place my mind on my body as i'm running, notice my knee is a little sore, that my hamstring is bothering me today or my hips. you can be mindful in that way as well to prevent injury. i found that yes, you can still try to achieve, but you can also say it will enjoy the journey. all finished. umm... you wouldn't want your painter to quit part way,