The "optimal window of opportunity" is generally recognized as the first hour post workout. This seems to be the "critical" period of time for consuming a quality carbohydrate and protein meal. For those interested in size and strength or recovery from athletic events, the sooner the better. However, many athletes may miss this optimal window due to a variety of factors. Some of these factors include a lack of focus on nutrition, or poor planning for meal availability. For many, this makes the convenience of ready-to-drink shakes and meal bars a must for proper recovery.