Since my house is set quite a way back from the nearest public road, I try to exercise by walking from my house to that road and back, weather permitting. It takes about 20 minutes to complete three round trips, just enough time to pray five decades of the Rosary. But I find it hard to concentrate on praying that, as I am moving all the time, sometimes going uphill and sometimes, downhill. So I switched to mainly calling on the Holy Name of Jesus. Since I only need to focus upon the name "Jesus," distractions are no longer invasive. And I sincerely believe that when I pray thus fervently, the Lord already knows everything that's in my heart without my having to tell it all to him. A simple prayer is also worth a thousand words or more.