In reply to The New NickB:
Day 1
Look around the west end - maybe transport museum, Kelvingrove museum*, through kelvingrove park (park circus side too but that is a diversion) to Glasgow University* (look round the old buildings overlooking the park) - all walkable. Science centre across the clyde from the secc is really for kids but the tower at the science centre is only about a fiver and is really good if the weather is right. Occasionally the tower at Glasgow Uni is open too.
Day 2
City centre (via Mitchell library if you fancy that) , museum of mordern art on exchange square, lighthouse building also has a tower for great views over rooftops of city centre. Religious museum?
Not that I'm weirdly obsessed with towers and urban views but if so obsessed there also good views from top floor of multistorey cinema (cineworld, renfield st, no need to buy ticket to access top floor).
Burrell collection
Running - not that i would do such a thing - north bank of cylde to glasgow green up through city centre to canal at spiers wharf, canal to river kelvin at maryhill locks, follow river kelvin back to secc area
if you want to do hill reps go to Gardner Street! (or Kelvingrove park)
*must do (in my opinion)