Walking vs running: which one actually protects your heart?
Both lower cardiovascular risk. The differences show up in dose, joints and how likely you are to keep going.
Muscle loss accelerates from midlife, and resistance training is the only intervention that reverses it. Here is a realistic starting plan.

You lose roughly three to eight percent of muscle mass per decade after thirty, and the rate accelerates later. Loading the muscle is the countermeasure.
You do not need a complicated split. Two full-body sessions a week, covering six fundamental patterns, produce most of the available benefit.
Add a little weight or a rep when the last set still feels controlled. Stop two reps short of failure on most sets. Soreness is not the goal; consistency and gradual load are.
Protein intake, sleep and at least one full rest day between sessions do as much for your results as the sets themselves.
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Both lower cardiovascular risk. The differences show up in dose, joints and how likely you are to keep going.