Lightweight inflatable device for play or training

A lightweight device for training and/or play, comprising:

• a flexible outer layer having a diameter;
• an inflatable inner bladder, the inner bladder being made of a material and having a maximum diameter when the inner bladder is unconstrained that is sufficiently greater than the maximum diameter of the outer layer such that when the inner bladder is inside the outer layer, the inner bladder is adapted to bunch up or fold against the inner surface of the outer layer upon inflation of the inner bladder;
• the outer surface of the inner bladder being bunched up or folded against at least most of the inner surf ace of the outer layer;
• and
• the bunched up or folded outer surface of the inner bladder being adapted to at least partially change configuration to absorb energy upon impact at an area of impact;
• wherein the device has a circumference of at least 68 cm and weighs less than about 3 ounces;
• wherein there is no filler material or stuffing within the inner bladder.

A lightweight device for training and/or play, comprising:

• a flexible, tear-resistant outer layer having a diameter;
• an inflatable inner bladder;
• at least portions of the outer surface of the inner bladder when inflated being bunched up or folded against the inner surface of the outer layer;
• the bunched up outer surface of the inner bladder being adapted to absorb energy upon impact at an area of impact;
• wherein there is no filler material or stuffing within the inner bladder;
• wherein the inner bladder has an unconstrained maximum dimension at least 1.25
• times greater than the maximum dimension of the outer layer.