RDA of Calcium is 1000mg for moderately active person, in age group 19-50 years. 

RDA means recommended Daily Allowance. 

(And it's not mentioned for specific period.) 

It's better to be taken through food. But on daily basis to get this much amount is little difficult. Plus to get different supporting minerals like vit D, vit C is also logistically impractical to get daily basis. 

Therefore smart way to make sure getting adequate calcium is through right balance of calcium rich foods and calcium supplements. 

Richest source calcium like dairt foods give us around 100mg through 100ml dairy/

1 ragi bhakari /100gm pulses like chana rajma.

So if for any day Or most of days we are unable to take above calcium rich foods , take differentiated amount through elemental calcium. 

 Calcimax Forte:

Calcimax forte has 1 tablet 1000mg calcium carbonate from which 400mg is elemental calcium.

• Experts typically suggest a daily dose of no more than 500 milligrams (mg) of supplemental calcium. 
• A doctor might recommend short-term use of higher dose calcium (up to 1,000 mg).

Advantage of taking supplements. 

As discussed above, it's smart ,sure way to meet daily advisable dose. 

It prevents bone loss. 

With age body's ability to absorb calcium from foods deteriortes. Therefore direct intake of calcium element enables body for its absorption. 

Side effects:

Possible side effect but bot yet scientifically proven. 

Excessive intake of calcium carbonate can lead to health issues such as heart rhythm disturbances, kidney stones, constipation, and digestive problems.

Calcium can also decrease absorption of some medications, including osteoporosis medicines, thyroid medicines, and some antibiotics.

My Suggestions

-Currently you are taking 1 tablet of calcimax forte. 

This comes in RDA range. 

-Possible Health issues mentioned above are individual specific and not proven /reasesrched.

If eaten with food, taking vitamin C along with calcium supplements, drinking enough water, eating enough fruits, vegetables.. We don't need to worry about above digestive related, heart rhythm issue and kidney stones. 

-Another issues mentioned with medicines absorbtion, for this it's always recommended to take calcium supplements separately. 

-You are also doing exercise which helps in regular calcium utilization. 

Prescription:

- you can continue taking 1 tablet daily. 

- on days when there is more consumption of calcium rich foods , that day Or next day you may skip supplement. 

- some weeks you may consider to take alternative days. 

This will ensure to meet RDA as well as can prevent possible side effects/overdose.

Ref- 

https://www.webmd.com/vitamins-and-supplements/calcium

https://health.clevelandclinic.org/too-much-calcium-supplements

https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/expert-answers/calcium-supplements/faq-20058238