If you are completely sedentary (some one really out of shape) then I would consider that high intense cardio. Now for someone who is an athlete probably more on the moderate side (75%). High intense is like a run. Kind of what how we felt running the mile in high school. Horrible HAHHA
Shin Splints
Strengthen anterior tibialis (look up some exercises for it too hard to explain)
Stretch Gastrocnemius (calve larger part by keeping leg locked during stretch)
Foam roll or deep tissue massage the anterior tibialis