You met with a personal trainer who outlined a killer strength training routine to tone your entire body. You learned correct form and the order of the exercises, and you've been doing this exact routine twice a week for a month. That's awesome, but if you continue to work out the same way each time, you're sure to reach a plateau when it comes to seeing results.
In order to strengthen your muscles effectively, you've got to keep them guessing. The easiest way to do that is to mix up the order you work your muscles. If you're used to starting with bicep curls and triceps dips to work your arms, start with squats and lunges instead, and work your arms last. Tiring out your muscles in a different order will not only be more challenging, but varying your routine will also prevent boredom.