Full answer: I reckon cycling will give you alot of the aerobic benefits if you work at same intensity so intervals of 400m for example would have to be the same time but obviously give you a longer rep distance. As 400m on bike won't really stress you because it'll be over so quick. I love my turbo trainer because if its ever snowing or I'm injured I can always use that. Injurys always seem aggravated buy impact for me. Cycling removes this problem. ultimately though nothing trains you for running like running. Over time the miles strengthen up all the things that are stressed ie bones (metatarsals, ankle, heel, shin, hip ect) tendons, ligaments and muscles. no substitute I don't think.
Not a swimmer I'm afraid so can't really help there. Sure the tri people can help.
Nice pb there Mennania. Did you find the course tougher than others. Alot of people seemed to be down on pb's by similar ammounts. One guy from my club pb'd by 11 seconds at sport in port but I cant help thinking its not a true representation of what he's capable of because his pb before was from Trafford (pancake flat) and he's since smashed his 5k pb so I dont think sport in port is an easy course by looks of it.
Wheres Stevie G got to? *worried face* back running again now after foot hiccup last week. Impromptu easy week sorted anyway. Slightly paranoid now that just coz I cant feel nothing from the foot its not gone away. Allways lack confidence after niggles. Oh well onwards and upwards. Atleast legs will be rested for Stone 10k this weekend.
800m is a good distance arguably the best rep distance for 5k training if there is a jog recovery perhaps. Its short enough that it can be done at a fast pace but long enough to stress aerobic system. I say jog recovery because I think any runner would have to have there heart rate raised for the whole session because its then going to be giving more time at vo2 intensity. If a rep takes 2:30 then theres probably 2:00 minutes of the rep at a high intensity when walking recoveries. But if the recoveries are a jog then this could be pushed up to maybe 2:15 so the heart is up within 15 secs perhaps.
To keep on the thread topic I dont think its a good lactate threshold session really as 800m is to short. mile reps or 2k reps are best for this I think.