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Stretching Recommendations The American College of Sports Medicine (ACSM) recommends flexibility exercises for all of the major muscle-tendon groups - neck, shoulders, trunk, lower back, hips, legs, ankles - 2-3 times per week. Spend up to 60 seconds on each stretch; if you can only hold the stretch for 20 seconds, repeat the stretch three times. Never bounce into a stretch. Perform dynamic stretches before your workout. Perform static stretching after your workout. If you are doing a separate stretching session, do a 5 minute warm up of cardio and dynamic stretches.
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Nick Swettenham (Total Fitness After 40: The 7 Life Changing Foundations You Need for Strength, Health and Motivation in your 40s, 50s, 60s and Beyond)