Thank you for choosing HCM.
Your weight should be around 70-78 (ideal) .
Yes you can take a lean mass gainer as it helps in burning fat and also putting lean muscle mass , and no there are no side effects to it , any multivitamin
is always good for an active person , no need to take any medicines to increase your strength , just have the lean mass gainer and you can also add a pre workout shake to your regimen.
Thank you and take care