Your core supports you when you run, and having a strong core will keep you going when you're tired. --------------------------------------------------------------------------
It is very important to have good core strength, it'll help your body be used to running for a long time without any breaks. Especially since in cross-country you have run on hills, in mud, gravel, rivers, and anything really. Cross-country isn't like track and has just one type of ground. Which means you need a lot more strength in certain areas.
Runners should have a strong core, but running helps the core alone. If you to build it up more I recommend not every day but every other day
Golf. Conversely, a sport which exerts a lot of force on your core muscles is Cross Country. It doesn't look the part but when you start running long distances you'll realise that you need to contract your core muscles all the time or you won't be able to sustain the pace.
WHAT
The material the core is made of does not affect the strength of an electromagnet. The strength is primarily determined by the number of turns in the wire coil, the current flowing through the coil, and the shape of the core.
I think it is a core country.
Yes, changing the core of an electromagnet can affect its strength. The core material influences how well the magnetic field is conducted, which in turn can impact the overall strength of the electromagnet. Materials with high magnetic permeability, such as iron or steel, can increase the strength of the electromagnet compared to non-magnetic materials.
yes
The plank is one.
no
Snorkeling
Core training
squats and deads for core strength