Here's a cool idea to try on your next workout.

Forget about reps. Instead of counting how many times you can lift a particular weight, try setting a timer. You're not allowed to stop moving the weight until the time is done.

There is a concept known to the Exercise Science community as time under tension. The idea is that it doesn't matter how many reps you complete, just how long your muscles are working against resistance. I can't say I buy the theory completely, but I do think there may be some merit.

If nothing else, it adds some variety to your routine. So if you're getting bored with your workout, stop counting and start watching the clock!