Down to the minute. If you're chasing a 2h57min marathon then a sub3 plan isn't right for you, you need a 2h57min training plan.
Busy job? No problem, we'll work around it. Getting a PB doesn't have to take over your life.
JSET looks at your previous race performance and your training history. By comparing these it can assess how your body responds to training.
Let's do the type of running you enjoy. If you love running at a "chatting pace" with friends then do that. JSET tells you exactly how much "chatting pace" running you need to do.
Everyone is starting from a different place, so even two runners who have the same goal need different programs. JSET accounts for that.
(it'll also adapt)
JSET adapts according to how well your training is going. Say hello to overachieving!