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Do threshold running once a week. Training for a 9min/mile marathon in april so been doing threshold running at 8.3min/mile. Buillt the set up to 8mins * 4 with 90 secs recovery between.
What would be most beneficial next, increasing the pace, increasing the duration, increasing the reps or decreasing the recovery? Or play with all of the above.
I dont do any fast interval training (I do hills however) so my intitial thought was to increase speed but any advice appreciated. Thanks.