To reach these findings, researchers monitored heart rates of individuals with varying fitness levels over a 24-hour period, including during training sessions. “Even if you’re training hard for an hour a day, your heart beats more slowly for the other 23 hours. Reference: Mizuki Nagata et al, Wnt-directed CXCL12-expressing apical papilla progenitor cells drive tooth root formation, Nature Communications (2025). Exercise: Study Reveals Which One Really Boosts Vascular Health? Comparing the effects of yoga and exercise on vascular function: A systematic review.