Meaning: Lower means reduced or diminished in amount or degree.

Wrong options:

• physical: 'Physical' is an adjective that relates to the body, which does not fit the context of cortisol levels.
• mental: 'Mental' refers to the mind, which is not relevant when discussing cortisol levels.
• endurance: 'Endurance' refers to the ability to withstand hardship, which does not pertain to cortisol levels.
• community: 'Community' refers to a group of people, which is unrelated to the measurement of cortisol levels.
• productivity: 'Productivity' refers to the effectiveness of productive effort, which does not apply to cortisol levels.
• resilience: 'Resilience' refers to the ability to recover from difficulties, which does not fit the context of cortisol levels.

Correct answer: boost

Explanation: The verb 'boost' is used here to indicate an increase in mood, fitting grammatically as it describes the action performed by endorphins. It aligns with the context of enhancing happiness through physical activity.

Meaning: Boost means to increase or improve something.

Wrong options:

• lower: 'Lower' is an adjective that indicates a decrease, which contradicts the idea of improving mood.
• physical: 'Physical' is an adjective that does not convey an action related to mood enhancement.
• mental: 'Mental' is an adjective that describes the mind but does not indicate an action to improve mood.
• endurance: 'Endurance' refers to the ability to withstand physical exertion, which does not relate to mood improvement.
• community: 'Community' refers to a group of people and does not fit as an action related to mood.
• productivity: 'Productivity' refers to the effectiveness of work, which does not apply to mood enhancement.
• resilience: 'Resilience' refers to the ability to recover from difficulties, which does not fit the context of boosting mood.

Correct answer: mental

Explanation: The word 'mental' is an adjective that describes well-being in terms of psychological health. It fits grammatically as it modifies 'well-being' and is contextually appropriate in discussing mindfulness.

Meaning: Mental refers to anything related to the mind or psychological state.

Wrong options:

• lower: 'Lower' is an adjective that does not describe a type of well-being and is irrelevant in this context.
• physical: 'Physical' refers to the body, which does not pertain to psychological well-being.
• endurance: 'Endurance' refers to the ability to withstand hardship, which does not fit the context of well-being.
• community: 'Community' refers to a group of people and does not describe a type of well-being.
• boost: 'Boost' is a verb that indicates an action, which does not fit as a descriptor for well-being.
• productivity: 'Productivity' refers to effectiveness in work, which is unrelated to well-being.
• resilience: 'Resilience' refers to the ability to recover from difficulties, which does not fit as a descriptor for well-being.

Correct answer: endurance

Explanation: The word 'endurance' is a noun that refers to the ability to withstand physical exertion. It fits grammatically as it serves as the subject of the sentence and is contextually relevant to outdoor activities requiring physical effort.

Meaning: Endurance refers to the capacity to endure an unpleasant or difficult process or situation without giving way.

Wrong options:

• lower: 'Lower' is an adjective that does not describe a level of physical capability and is irrelevant in this context.
• physical: 'Physical' is an adjective that does not serve as a noun to describe a requirement for outdoor activities.
• mental: 'Mental' refers to the mind and does not relate to physical capability in outdoor activities.
• community: 'Community' refers to a group of people and does not fit as a descriptor for physical capability.
• boost: 'Boost' is a verb that does not fit as a noun describing a requirement for outdoor activities.
• productivity: 'Productivity' refers to effectiveness in work, which does not apply to physical capability.
• resilience: 'Resilience' refers to the ability to recover from difficulties, which does not fit as a descriptor for physical capability.

Correct answer: community

Explanation: The word 'community' is a noun that refers to a group of people with shared interests. It fits grammatically as it serves as the object of the sentence and is contextually relevant to the social aspect of outdoor activities.

Meaning: Community refers to a group of people living in the same place or having a particular characteristic in common.

Wrong options:

• lower: 'Lower' is an adjective that does not describe a social aspect and is irrelevant in this context.
• physical: 'Physical' is an adjective that does not pertain to social relationships and is not appropriate here.
• mental: 'Mental' refers to the mind and does not relate to social aspects of outdoor activities.
• endurance: 'Endurance' refers to the ability to withstand hardship, which does not fit the context of social relationships.
• boost: 'Boost' is a verb that does not fit as a noun describing a social aspect.
• productivity: 'Productivity' refers to effectiveness in work, which does not apply to social relationships.
• resilience: 'Resilience' refers to the ability to recover from difficulties, which does not fit as a descriptor for social aspects.