Cardio Weight barring Base

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The concern with all training is that it gets complicated. lets start with Cardio.
The Beginner
Week one
Stretch
Half squats us a folding chair to touch your but on. 2 sets of 12
sit ups two sets to failure. (Goal 2 sets of 50)
Leg lifts two sets to failure
Walk one mile/ride 3 miles
Try this tell me how it works for the beginner