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Outdoor exercise is still manageable for now, but as summer approaches, intense heat can make it difficult to stay active outside. Experts say it is a good idea to prepare one or two workouts that can easily be done indoors during the hottest months.

So which indoor exercises provide the biggest results in the shortest amount of time? According to U.S. health and lifestyle magazine Prevention, the following exercises are effective for weight loss and building a toned physique.

Push-ups