I find v02 max work so hard (yes I know supposed to be hard!). I can do 2x40 or 1x75 at 90% without much issue but yesterday really struggled with Givens+1 which is 2.5min intervals at 118%.
Let’s face it, 9 x 2.5 mins is at the very low end of time for v02 intervals but was really struggling and quit on last interval.
Therefore I guess the workout was a success but idea of 3 min intervals or longer seem impossible at moment!
I guess question is…will 2.5mins do the job (usually hit 95%max HR after around 60-75 secs after first 2 intervals) or do I need longer intervals but know might only manage say 4-5 intervals of 3 mins