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The early bird catches the worm, or so they say, and with the longer days and the weather heating up, now is a good time to take your workouts outside. Not only is it easier to stay consistent with morning workouts – because of the lack of social and work events planned earlier in the day – but US researchers also found adherence is often highest in the morning. Getting a dose of the ‘sunshine’ vitamin D will support healthy bones and a strong immune system, plus exercising in the open air can put you in a a great mood for the rest of the day – think reduced symptoms of anxiety, anxiousness and even loneliness, according to a study published. Ready for a natural caffeine boost? Here are four outdoor workouts that will supercharge your morning.