Hypoxic training is a part of many swimmers' workouts. As Allen mentioned, however, the risk of shallow water blackout is present if the training is done underwater, for extended periods of time, and with prior hyperventilation. It's also never a good idea to do hypoxic training sets on your own.
There is a series of three articles on shallow water blackout featured on SwimSwam (and lately, more such articles have appeared on sources such as Swimming World). Here is Part 2 on the facts: swimswam.com/.../
Hypoxic training is a part of many swimmers' workouts. As Allen mentioned, however, the risk of shallow water blackout is present if the training is done underwater, for extended periods of time, and with prior hyperventilation. It's also never a good idea to do hypoxic training sets on your own.
There is a series of three articles on shallow water blackout featured on SwimSwam (and lately, more such articles have appeared on sources such as Swimming World). Here is Part 2 on the facts: swimswam.com/.../
