These can be done anywhere, but they are great to incorporate when you are on a walk (or run) with your baby. While holding the stroller, alternate stepping forward with each foot. After your foot lands forward, hold for a few seconds, then push through the front heel and return to your start position. Repeat opposite leg. Make sure your knee does go past your toes. Remember to breathe; inhale as your step forward and exhale as you step backwards. An alternative is doing this while "wearing" your baby (in a sling, wrap, or carrier); added weight will make this more challenging so go slowly and don't do as many repetitions especially if you are a beginner.