References

Strength

• Loading Recommendations for Muscle Strength, Hypertrophy, and Local Endurance (pmc.ncbi.nlm.nih.gov)
• NSCA Training Load Chart (Landers, 1984) (www.nsca.com, PDF)
• Essentials of Strength Training & Conditioning (www.nsca.com)
• NSCA Strength Training Guidelines (www.nsca.com)

Heart Rate Zones

• Heart Rate Zones Explained (health.clevelandclinic.org)
• Heart Rate Zones (polar.com)
• Understanding Heart Rate Zones for Effective Workouts (healthline.com, article cites more references)