recovery, once you get out of the environment, should be fast enough. >> now, some of these kids are as young as 11 years old. they're all presumably very fit, being part of a soccer team, if you will. is that an advantage for them, or is it a mixed issue, if you will? >> it's a mixed issue because it's an advantage because we know they can perform physical activity very properly, but the problem is you should expect they have more muscles than a regular kid. so more muscles means more oxygen consumption. more oxygen consumption will increase their breathing rate and deplete the oxygen levels in their tanks. so we should recalculate that