mastertrainerprimer: TIP: Allocate your sub breath-holding exercises, with each scheduled training session start out by timing him. If he beats his past record, then write it down and have him practice that duration until he can match it without
mastertrainerprimer: TIP: Allocate your sub breath-holding exercises, with each scheduled training session start out by timing him. If he beats his past record, then write it down and have him practice that duration until he can match it without
