Lunges are super powerful but can cause joint pain if done wrong. Make sure your knees are right over your toes. All the power (and/or pain) will be in that front leg. Your back leg is just there for some support! Belly button pulled in super tight, chest up & SQUEEZE!
Try this for 1 minute, the rest 30 seconds, 1 more minute, then rest 30 seconds.... 4x TOTALLY THROUGH!
How did you do??? Write it down with todays date!