The road to a stronger, healthier heart really can be a walk in the park. Researchers at Indiana University studied people with pre-hypertension (they had a blood pressure of 120-139 over 80-89) and found that those who took four 10-minute walks a day lowered their blood pressure more than those who took one 40-minute walk. The effect also lasted longer: around 11 hours after the fourth walk, compared with seven hours for the single walk. Whether you're strolling with your dog, hoofing it to work, or heading outside for your lunch break, take 10 for your ticker.

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