While we do burn some extra calories rebuilding muscles after say long session of cardio your numbers (at least for running) for 70kg person are OK. There may b

While we do burn some extra calories rebuilding muscles after say long session of cardio your numbers (at least for running) for 70kg person are OK. There may be also an appetite suppressing effect of exhausting training sessions. There is no way that not even overweight but a middle aged mostly, sedentary person can do 10 miles runs 6x a week. IMHO one should start with biking and walking which are way easier on the joins and start running after getting to the level when 50km rides are not causing you any problems. This assuming your BMI is not way above 25.