High Intensity Interval Training is great for breaking a plateau. They're also great if you're bored with the same old routine workouts. Throw in a HIIT workout every 2 weeks to boost your metabolism and break your routine! 

Stair stepper - 10 minutes

Jump rope - 100 reps

Self Squats - 30 reps

Jump rope - 100 reps

Self squats - 40 reps

Jump rope - 100 reps

Self squats - 50 reps

Jump rope - 100 reps

Self Squats - 60 reps