If you're talking about running, I wouldn't run every day. I'd run for 3-4 days and do something else on the other days. (I run 4 days a week and do other lower-impact cardio on M/W/F so I don't over-stress my joints.) I probably also personally wouldn't do high-impact intervals more than a couple days a week - even when I'm training for a race, I only do speedwork once a week and other types of running (hills, long run, trail) the other days.
If you're talking about weight-lifting, I wouldn't exercise the same body parts every day - I would rotate between the body parts so that muscles can recover from the microscopic tears that lifting causes.
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