Some I use together
Timer between sets at the gym really keeps me on schedule and minimizes wasting time.
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Netflix with others
Map with others
Calendar with to-do app is convenient.
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WhatsApp video chat as an overlay on anything else is great, so I can look at something interesting whilst the gf is rabbiting on, haha.
Oh and for your gym training, I recommend trying out Jefit. Logs everything, keeps it organised and has all the timers built in 
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this
Netflix and navigation works really well. Especially if you drive taxis.