I LOVE singles because of the 1 on 1 challenge of it all, but with my recent weight gain, I find it harder and harder to keep up. I'm a 4.0 but usually I practice a lot with my friends who are 4.5 and 5.0, respectively. After an hour or so they are just getting revved up while I am gasping for air (and incredibly hungry). I used to be really competitive with them and so I am excited and determined to get back there again!