How Many Interval Sets???

Former Member
Former Member
Ok Guys, This is a question that has been bugging me for a while.I'm doing a lot of interval sets to try and get my 400M Free time down.I'm doing sets of 4 x 100 metres on 2.30 mins.During a training session of say 90 minutes how many of these should I do??I mean if I can reduce my times by just doing say 5/6 per session is this sufficient to have the necessary effect on my swimming? Thanks, mark:cool:
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