Why can't I bench as much as I did last week?

There are several reasons why you may not be able to bench as much as you did last week. It could be due to factors such as fatigue, lack of proper rest or recovery, changes in your diet or hydration levels, or simply not having enough time to properly warm up before your workout. It's important to listen to your body and make adjustments as needed to prevent injury and continue making progress in your strength training.