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