About 100 volunteers are being sought for the study, half of which will be asked to take part in indoor activities and half outdoor exercise.

BBC: Exercise

"If you have a choice to plan an outdoor event versus an indoor event, people with spring allergies, who have tree pollen allergies, would be better off choosing indoor activities during the peak pollen season, " he said.

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An indoor component focuses on classroom activities.

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Fun old-fashioned activities like boating, indoor and outdoor tennis, and fishing remain popular, Booth said.

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The indoor group will be asked to go swimming or to visit the gym while the outdoor group take part in activities such as gardening, walking or golf.

BBC: Exercise