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Keep them involved this way. X Nitro Force A popular workout hint is to place your tongue up to your mouth's roof while doing sit-ups or crunches. This position engages your neck muscles and gives you the correct alignment while working your abs. You can prevent injury and strain if you do this. X Nitro Force Lightly work the same muscles that were used for exercising yesterday. This is an easy way to work on muscles that are tired expending very little effort. X Nitro Force Get the whole family