male -- keywords

(man OR men OR gentlemen OR gentleman OR male OR males OR husband* OR father* OR son OR sons OR grandson* OR nephew* OR step-son* OR “step son” OR “step sons” OR stepson* OR step-father* OR “step father” OR “step fathers” OR stepfather* OR father-in-law OR fathers-in-law OR “father in law” OR “fathers in law” OR monk OR monks OR widower OR widowers OR bachelor* OR uncle* OR brother* OR step-brother* OR “step brother” OR “step brothers” OR stepbrother* OR grandfather* OR grandpa* OR paternal OR paternity OR fatherhood OR inseminat* OR semen OR “seminal fluid” OR “seminal vesicle” OR “seminal vesicles” OR testic* OR testes OR testis OR scrotum OR scrotal OR prostate* OR “vas deferens” OR seminiferous OR penis OR penile OR circumcis* OR circumciz* OR orchiectom* OR vasectom*)

for male children include
boy OR boys

when searching for articles about adult males, also consider ORing in:
king OR kings OR duke* OR prince OR princes

infants -- keyword

(infant* OR baby OR babies OR NICU OR neonat* OR perinatal OR preemi* OR prematurity OR Premi OR premie OR premies OR preterm OR bairn* OR newborn* OR suckling* OR weanling*)

consider ORing in species-specific words if searching for articles focused on non-humans
consider Oring in birth and obstetric words if appropriate
e.g.
birth OR births OR deliver* OR labor OR obstetric* OR cesarean OR caesarean OR forcep* OR extract*

Rural -- MeSH

"Rural Population"[Mesh] OR "Rural Health Services"[Mesh] OR "Hospitals, Rural"[Mesh] OR "Rural Health"[Mesh] OR "Wilderness"[Mesh] OR "Wilderness Medicine"[Mesh] OR "United States Indian Health Service"[Mesh]

neuroendocrine tumors -- MeSH and keyword

("neuroendocrine adenoma" OR "neuroendocrine adenomas" OR "neuroendocrine tumor" OR "neuroendocrine tumors" OR "neuroendocrine cancer" OR "neuroendocrine cancers" OR "neuroendocrine carcinoma" OR "neuroendocrine carcinomas" OR "neuroendocrine neoplasm" OR "neuroendocrine neoplasms" OR (("Cushing's syndrome" OR "Kulchitsky cell") AND (adenoma[tiab] OR adenomas[tiab] OR tumor[tiab] OR tumors[tiab] OR cancer[tiab] OR cancers[tiab] OR carcinoma[tiab] OR carcinomas[tiab] OR neoplasm[tiab] OR neoplasms[tiab] OR neoplastic[tiab] OR malign* OR metastas* OR metastat*)) OR carcinoid*[ti] OR vipoma* OR "Verner-Morrison syndrome" OR "pancreatic cholera" OR WDHA[tiab] OR "watery diarrhea hypokalemia and achlorhydria syndrome" OR apudoma* OR gastrinoma* OR "Zollinger-Ellison syndrome" OR insulinoma*[ti] OR Glucagonoma* OR Somatostatinoma* OR GRFoma* OR ACTHoma* OR PPoma* OR "islet cell tumor"[ti] OR "islet cell tumors"[ti] OR "pancreatic endocrine tumor" OR "pancreatic endocrine tumors" OR "Merkel cell carcinoma" OR "small cell carcinoma" OR pheochromocytoma*[ti] OR neuroblastoma*[ti] OR "medullary carcinoma" OR "medullary carcinomas" OR Paraganglioma* OR ((acidophil[tiab] OR basophil[tiab] OR chromophobe[tiab] OR secrete OR secreting OR secretion OR corticotroph OR "growth hormone" OR ACTH OR prolactin OR gonadotropin* OR "follicle-stimulating hormone" OR Luteinizing OR prolactin* OR FSH OR FSH-secreting OR LH OR LH-secreting) AND pituitary[tiab] AND adenoma*[tiab]) OR "Neuroendocrine Tumors"[MeSH:NoExp] OR "Adenoma, Acidophil"[mesh] OR "Adenoma, Basophil"[mesh] OR "Adenoma, Chromophobe"[mesh] OR "Apudoma"[mesh] OR "Carcinoid Tumor"[mesh] OR "Carcinoma, Neuroendocrine"[mesh] OR "Paraganglioma"[mesh] OR (("Gonadotropins, Pituitary"[mesh] OR "Human Growth Hormone"[mesh] OR "Growth Hormone"[mesh] OR "secretion"[sh]) AND "pituitary neoplasms"[mesh]) OR "Growth Hormone-Secreting Pituitary Adenoma"[mesh] OR "Prolactinoma"[mesh] OR "Nelson Syndrome"[mesh] OR "ACTH-Secreting Pituitary Adenoma"[mesh] OR "Zollinger-Ellison Syndrome"[mesh] OR "Gastrinoma"[mesh] OR "Insulinoma"[mesh] OR "Growth Hormone-Secreting Pituitary Adenoma"[mesh] OR "Neuroblastoma"[mesh])

Tai Chi -- keywords and MeSH

("Tai Ji"[MeSH] OR "T'ai Chi" OR "Tai Chi" OR "Tai Ji" OR Taiji OR Taijiquan)

Exercise -- MeSH

("Exercise Movement Techniques"[Mesh] OR "Locomotion"[Mesh] OR "Sports"[Mesh] OR "Dancing"[Mesh] OR "Physical Fitness"[Mesh] OR "Physical Education and Training"[Mesh] OR "Exercise"[Mesh] OR "Exercise Therapy"[Mesh] OR "Motor Activity"[mesh])

Depending on the search topic, consider ORing in "Leisure Activities"[mesh]. If "Leisure Activities"[mesh] is included, the narrower headings "Sports"[mesh] and "Dancing"[mesh] can be removed.

exercise -- keywords

(athlete* OR athletic* OR "active lifestyle" OR "physical activity" OR "physical education" OR fitness OR "physically fit" OR recreation OR exercis* OR jazzercise OR aerobics OR work-out OR workout OR "working out" OR "physical conditioning" OR calisthenic* OR yoga OR "tai chi" OR karate OR judo OR gymnastic* OR acrobatic* OR tumbling OR "tae kwon do" OR taekwon-do* OR taekwondo OR "martial arts" OR activity OR walking OR fitness OR "physical education" OR sport OR sports OR baseball OR football OR basketball OR tennis OR volleyball OR badminton OR bowling OR hockey OR lacrosse OR rugby OR soccer OR track OR wrestling OR wrestler* OR wrestled OR walk OR walking OR walked OR walks OR jog OR jogging OR jogs OR jogged OR jogger* OR run OR running OR run OR runs OR ran OR runner* OR marathon* OR sprint OR sprints OR sprinting OR sprinted* OR sprinter* OR boxing OR boxer* OR climbing OR climber* OR biking OR bicycling OR bikes OR bike OR biked OR bicyclist* OR hiking OR hike OR hikes OR hiked OR hiker* OR rafting OR kayak* OR canoe* OR row OR rows OR rowed OR rowing OR rower* OR swimming OR swim OR Swam OR swims OR rower* OR "track and field" OR jumping OR jump OR jumps OR jumped OR jumper* OR trampoline OR "lift weights" OR "weight lifting" OR dance OR dances OR danced OR dancing OR dancer* OR skating OR skate OR skates OR skated OR skater*)