Table 1.

The searching strategy for WOS

Set	Search query
#1	TOPIC: “low back pain” or lumbago or “Ache, Low Back” or “Low Backaches” or “CLBP” or “Back Pain, Low” or “Low Back Ache” or “Postural low back pain” AND DOCUMENT TYPES “Article” AND LANGUAGE “English” or “Chinese”
#2	TOPIC: “physical activity” or “exercise” or “training” or “physical therapy” AND DOCUMENT TYPES “Article” AND LANGUAGE “English” or “Chinese”
#3	TOPIC: “senior” or “older” or “elderly” or “old aged” or “older age” AND DOCUMENT TYPES “Article” AND LANGUAGE “English” or “Chinese”
#4	#1 AND #2 AND #3