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Do you have some dumbells at home?
I know this is pitched as a BEEFCAKE RAAAAAR! program but its actually pretty much about core strength if you're starting from scratch.
https://www.coachmag.co.uk/fitness/workouts/dumbbell-workouts
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Training your core under load is important - this can be achieved through weights and bands. Also look to train it across multiple planes of movement - twists, shoulder taps, deadbugs, bosu ball crunches, gym ball tuck crunches, hanging leg raises too.
If you dont have balls etc then benches, a towel of a wooden floor, something heavy can make do and mend.
I'd also say to not forget your back - a strong and mobile back will help keep your core strong and help keep your head up and breathing strong all the way through.In this weather a 20min core/tanning exercise is a daily must do ;)
Has anyone got a core strength plan they have used alongside training for the marathon? Realise I should probably do something, but don't have the time/money to join a gym - any recommendations appreciated!