If you’ve never done HIIT before or have a history of heart problems, it’s best to replace these workouts with moderate-intensity activities that keep your heart working steadily instead of pushing it to its limits.
### **2. Sprinting**
Sprinting requires explosive power and forces the heart to respond almost instantly to intense physical demand. This rapid increase in heart rate may increase the risk of irregular heart rhythms, dizziness, chest discomfort, or even more serious cardiovascular events in older adults.
Instead of all-out sprints, consider brisk walking, cycling, or light jogging at a comfortable pace. These exercises still improve endurance while placing much less stress on the heart.
